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</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#networkingfirewallallowping" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowPing
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowPing">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedtcpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedTCPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedTCPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_1" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedtcpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedTCPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedTCPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_2" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_1" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedudpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedUDPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedUDPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_3" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_2" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedudpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedUDPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedUDPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_4" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_3" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallautoloadconntrackhelpers" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.autoLoadConntrackHelpers
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.autoLoadConntrackHelpers">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_5" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallcheckreversepath" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.checkReversePath
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.checkReversePath">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_6" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_4" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallconnectiontrackingmodules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.connectionTrackingModules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.connectionTrackingModules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_7" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_5" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallenable" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.enable
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.enable">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_8" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextracommands" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraCommands
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraCommands">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_9" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_6" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextraforwardrules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraForwardRules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraForwardRules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_10" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_7" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrainputrules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraInputRules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraInputRules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_11" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_8" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrapackages" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraPackages
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraPackages">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_12" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_9" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrareversepathfilterrules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraReversePathFilterRules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraReversePathFilterRules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_13" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_10" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrastopcommands" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraStopCommands
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraStopCommands">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_14" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_11" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallfilterforward" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.filterForward
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.filterForward">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_15" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfaces" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_16" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedtcpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedTCPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedTCPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_17" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_12" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedtcpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedTCPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedTCPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_18" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_13" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedudpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedUDPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedUDPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_19" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_14" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedudpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedUDPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedUDPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_20" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_15" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogrefusedconnections" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logRefusedConnections
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logRefusedConnections">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_21" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogrefusedpackets" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logRefusedPackets
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logRefusedPackets">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_22" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogrefusedunicastsonly" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logRefusedUnicastsOnly
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logRefusedUnicastsOnly">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_23" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogreversepathdrops" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logReversePathDrops
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logReversePathDrops">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_24" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallpackage" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.package
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.package">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_25" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_16" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallpinglimit" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.pingLimit
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.pingLimit">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_26" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_17" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallrejectpackets" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.rejectPackets
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.rejectPackets">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_27" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalltrustedinterfaces" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.trustedInterfaces
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.trustedInterfaces">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_28" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_18" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../fooOverUDP/" class="md-nav__link">
<span class="md-ellipsis">
fooOverUDP
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../greTunnels/" class="md-nav__link">
<span class="md-ellipsis">
greTunnels
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../interfaces/" class="md-nav__link">
<span class="md-ellipsis">
Interfaces
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../iproute2/" class="md-nav__link">
<span class="md-ellipsis">
Iproute2
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../jool/" class="md-nav__link">
<span class="md-ellipsis">
Jool
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../macvlans/" class="md-nav__link">
<span class="md-ellipsis">
Macvlans
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nat/" class="md-nav__link">
<span class="md-ellipsis">
Nat
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../networkmanager/" class="md-nav__link">
<span class="md-ellipsis">
Networkmanager
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nftables/" class="md-nav__link">
<span class="md-ellipsis">
Nftables
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../openconnect/" class="md-nav__link">
<span class="md-ellipsis">
Openconnect
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../proxy/" class="md-nav__link">
<span class="md-ellipsis">
Proxy
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../resolvconf/" class="md-nav__link">
<span class="md-ellipsis">
Resolvconf
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../rxe/" class="md-nav__link">
<span class="md-ellipsis">
Rxe
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../sits/" class="md-nav__link">
<span class="md-ellipsis">
Sits
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../stevenblack/" class="md-nav__link">
<span class="md-ellipsis">
Stevenblack
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../supplicant/" class="md-nav__link">
<span class="md-ellipsis">
Supplicant
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../tcpcrypt/" class="md-nav__link">
<span class="md-ellipsis">
Tcpcrypt
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../ucarp/" class="md-nav__link">
<span class="md-ellipsis">
Ucarp
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../vlans/" class="md-nav__link">
<span class="md-ellipsis">
Vlans
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../vswitches/" class="md-nav__link">
<span class="md-ellipsis">
Vswitches
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../wg-quick/" class="md-nav__link">
<span class="md-ellipsis">
Wg quick
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../wireguard/" class="md-nav__link">
<span class="md-ellipsis">
Wireguard
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../wireless/" class="md-nav__link">
<span class="md-ellipsis">
Wireless
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../wlanInterfaces/" class="md-nav__link">
<span class="md-ellipsis">
wlanInterfaces
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../../programs/_1password-gui/" class="md-nav__link">
<span class="md-ellipsis">
Programs
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
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Security
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Systemd
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Users
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Virtualisation
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Nixpkgs
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</div>
<div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#networkingfirewallallowping" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowPing
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowPing">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedtcpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedTCPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedTCPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_1" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedtcpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedTCPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedTCPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_2" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_1" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedudpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedUDPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedUDPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_3" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_2" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallallowedudpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.allowedUDPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.allowedUDPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_4" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_3" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallautoloadconntrackhelpers" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.autoLoadConntrackHelpers
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.autoLoadConntrackHelpers">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_5" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallcheckreversepath" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.checkReversePath
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.checkReversePath">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_6" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_4" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallconnectiontrackingmodules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.connectionTrackingModules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.connectionTrackingModules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_7" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_5" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallenable" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.enable
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.enable">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_8" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextracommands" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraCommands
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraCommands">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_9" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_6" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextraforwardrules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraForwardRules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraForwardRules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_10" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_7" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrainputrules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraInputRules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraInputRules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_11" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_8" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrapackages" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraPackages
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraPackages">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_12" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_9" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrareversepathfilterrules" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraReversePathFilterRules
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraReversePathFilterRules">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_13" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_10" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallextrastopcommands" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.extraStopCommands
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.extraStopCommands">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_14" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_11" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallfilterforward" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.filterForward
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.filterForward">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_15" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfaces" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_16" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedtcpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedTCPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedTCPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_17" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_12" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedtcpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedTCPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedTCPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_18" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_13" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedudpportranges" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedUDPPortRanges
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedUDPPortRanges">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_19" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_14" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallinterfacesnameallowedudpports" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.interfaces.&lt;name&gt;.allowedUDPPorts
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.interfaces.<name>.allowedUDPPorts">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_20" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_15" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogrefusedconnections" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logRefusedConnections
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logRefusedConnections">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_21" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogrefusedpackets" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logRefusedPackets
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logRefusedPackets">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_22" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogrefusedunicastsonly" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logRefusedUnicastsOnly
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logRefusedUnicastsOnly">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_23" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalllogreversepathdrops" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.logReversePathDrops
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.logReversePathDrops">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_24" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallpackage" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.package
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.package">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_25" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_16" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallpinglimit" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.pingLimit
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.pingLimit">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_26" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_17" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewallrejectpackets" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.rejectPackets
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.rejectPackets">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_27" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#networkingfirewalltrustedinterfaces" class="md-nav__link">
<span class="md-ellipsis">
networking.firewall.trustedInterfaces
</span>
</a>
<nav class="md-nav" aria-label="networking.firewall.trustedInterfaces">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_28" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_18" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<h1>Firewall</h1>
<h2 id="networkingfirewallallowping" networking-firewall-allowPing="networking-firewall-allowPing"><code>networking.firewall.allowPing</code></h2>
<p>Whether to respond to incoming ICMPv4 echo requests
("pings"). ICMPv6 pings are always allowed because the
larger address space of IPv6 makes network scanning much
less effective.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default" networking-firewall-allowPing-default="networking-firewall-allowPing-default">Default</h3>
<p><code class="highlight"><span class="no">true</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallallowedtcpportranges" networking-firewall-allowedTCPPortRanges="networking-firewall-allowedTCPPortRanges"><code>networking.firewall.allowedTCPPortRanges</code></h2>
<p>A range of TCP ports on which incoming connections are
accepted.</p>
<p><strong>Type:</strong> <code>list of attribute set of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_1" networking-firewall-allowedTCPPortRanges-default="networking-firewall-allowedTCPPortRanges-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example" networking-firewall-allowedTCPPortRanges-example="networking-firewall-allowedTCPPortRanges-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="p">{</span><span class="ss">from</span> <span class="o">=</span> <span class="mi">8999</span><span class="p">;</span><span class="ss">to</span> <span class="o">=</span> <span class="mi">9003</span><span class="p">;</span><span class="p">}</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallallowedtcpports" networking-firewall-allowedTCPPorts="networking-firewall-allowedTCPPorts"><code>networking.firewall.allowedTCPPorts</code></h2>
<p>List of TCP ports on which incoming connections are
accepted.</p>
<p><strong>Type:</strong> <code>list of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_2" networking-firewall-allowedTCPPorts-default="networking-firewall-allowedTCPPorts-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_1" networking-firewall-allowedTCPPorts-example="networking-firewall-allowedTCPPorts-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="mi">22</span><span class="mi">80</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallallowedudpportranges" networking-firewall-allowedUDPPortRanges="networking-firewall-allowedUDPPortRanges"><code>networking.firewall.allowedUDPPortRanges</code></h2>
<p>Range of open UDP ports.</p>
<p><strong>Type:</strong> <code>list of attribute set of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_3" networking-firewall-allowedUDPPortRanges-default="networking-firewall-allowedUDPPortRanges-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_2" networking-firewall-allowedUDPPortRanges-example="networking-firewall-allowedUDPPortRanges-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="p">{</span><span class="ss">from</span> <span class="o">=</span> <span class="mi">60000</span><span class="p">;</span><span class="ss">to</span> <span class="o">=</span> <span class="mi">61000</span><span class="p">;</span><span class="p">}</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallallowedudpports" networking-firewall-allowedUDPPorts="networking-firewall-allowedUDPPorts"><code>networking.firewall.allowedUDPPorts</code></h2>
<p>List of open UDP ports.</p>
<p><strong>Type:</strong> <code>list of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_4" networking-firewall-allowedUDPPorts-default="networking-firewall-allowedUDPPorts-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_3" networking-firewall-allowedUDPPorts-example="networking-firewall-allowedUDPPorts-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="mi">53</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallautoloadconntrackhelpers" networking-firewall-autoLoadConntrackHelpers="networking-firewall-autoLoadConntrackHelpers"><code>networking.firewall.autoLoadConntrackHelpers</code></h2>
<p>Whether to auto-load connection-tracking helpers.
See the description at networking.firewall.connectionTrackingModules</p>
<p>(needs kernel 3.5+)</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_5" networking-firewall-autoLoadConntrackHelpers-default="networking-firewall-autoLoadConntrackHelpers-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallcheckreversepath" networking-firewall-checkReversePath="networking-firewall-checkReversePath"><code>networking.firewall.checkReversePath</code></h2>
<p>Performs a reverse path filter test on a packet. If a reply
to the packet would not be sent via the same interface that
the packet arrived on, it is refused.</p>
<p>If using asymmetric routing or other complicated routing, set
this option to loose mode or disable it and setup your own
counter-measures.</p>
<p>This option can be either true (or "strict"), "loose" (only
drop the packet if the source address is not reachable via any
interface) or false.</p>
<p><strong>Type:</strong> <code>boolean or one of "strict", "loose"</code></p>
<h3 id="default_6" networking-firewall-checkReversePath-default="networking-firewall-checkReversePath-default">Default</h3>
<p><code>true</code> except if the iptables based firewall is in use and the kernel lacks rpfilter support</p>
<h3 id="example_4" networking-firewall-checkReversePath-example="networking-firewall-checkReversePath-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;loose&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallconnectiontrackingmodules" networking-firewall-connectionTrackingModules="networking-firewall-connectionTrackingModules"><code>networking.firewall.connectionTrackingModules</code></h2>
<p>List of connection-tracking helpers that are auto-loaded.
The complete list of possible values is given in the example.</p>
<p>As helpers can pose as a security risk, it is advised to
set this to an empty list and disable the setting
networking.firewall.autoLoadConntrackHelpers unless you
know what you are doing. Connection tracking is disabled
by default.</p>
<p>Loading of helpers is recommended to be done through the
CT target. More info:
https://home.regit.org/netfilter-en/secure-use-of-helpers/</p>
<p><strong>Type:</strong> <code>list of string</code></p>
<h3 id="default_7" networking-firewall-connectionTrackingModules-default="networking-firewall-connectionTrackingModules-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_5" networking-firewall-connectionTrackingModules-example="networking-firewall-connectionTrackingModules-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="s2">&quot;ftp&quot;</span><span class="s2">&quot;irc&quot;</span><span class="s2">&quot;sane&quot;</span><span class="s2">&quot;sip&quot;</span><span class="s2">&quot;tftp&quot;</span><span class="s2">&quot;amanda&quot;</span><span class="s2">&quot;h323&quot;</span><span class="s2">&quot;netbios_sn&quot;</span><span class="s2">&quot;pptp&quot;</span><span class="s2">&quot;snmp&quot;</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallenable" networking-firewall-enable="networking-firewall-enable"><code>networking.firewall.enable</code></h2>
<p>Whether to enable the firewall. This is a simple stateful
firewall that blocks connection attempts to unauthorised TCP
or UDP ports on this machine.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_8" networking-firewall-enable-default="networking-firewall-enable-default">Default</h3>
<p><code class="highlight"><span class="no">true</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallextracommands" networking-firewall-extraCommands="networking-firewall-extraCommands"><code>networking.firewall.extraCommands</code></h2>
<p>Additional shell commands executed as part of the firewall
initialisation script. These are executed just before the
final "reject" firewall rule is added, so they can be used
to allow packets that would otherwise be refused.</p>
<p>This option only works with the iptables based firewall.</p>
<p><strong>Type:</strong> <code>strings concatenated with "\n"</code></p>
<h3 id="default_9" networking-firewall-extraCommands-default="networking-firewall-extraCommands-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;&quot;</span></code></p>
<h3 id="example_6" networking-firewall-extraCommands-example="networking-firewall-extraCommands-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;iptables -A INPUT -p icmp -j ACCEPT&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-iptables.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-iptables.nix</a></p>
<h2 id="networkingfirewallextraforwardrules" networking-firewall-extraForwardRules="networking-firewall-extraForwardRules"><code>networking.firewall.extraForwardRules</code></h2>
<p>Additional nftables rules to be appended to the forward-allow
chain.</p>
<p>This option only works with the nftables based firewall.</p>
<p><strong>Type:</strong> <code>strings concatenated with "\n"</code></p>
<h3 id="default_10" networking-firewall-extraForwardRules-default="networking-firewall-extraForwardRules-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;&quot;</span></code></p>
<h3 id="example_7" networking-firewall-extraForwardRules-example="networking-firewall-extraForwardRules-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;iifname wg0 accept&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-nftables.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-nftables.nix</a></p>
<h2 id="networkingfirewallextrainputrules" networking-firewall-extraInputRules="networking-firewall-extraInputRules"><code>networking.firewall.extraInputRules</code></h2>
<p>Additional nftables rules to be appended to the input-allow
chain.</p>
<p>This option only works with the nftables based firewall.</p>
<p><strong>Type:</strong> <code>strings concatenated with "\n"</code></p>
<h3 id="default_11" networking-firewall-extraInputRules-default="networking-firewall-extraInputRules-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;&quot;</span></code></p>
<h3 id="example_8" networking-firewall-extraInputRules-example="networking-firewall-extraInputRules-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;ip6 saddr { fc00::/7, fe80::/10 } tcp dport 24800 accept&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-nftables.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-nftables.nix</a></p>
<h2 id="networkingfirewallextrapackages" networking-firewall-extraPackages="networking-firewall-extraPackages"><code>networking.firewall.extraPackages</code></h2>
<p>Additional packages to be included in the environment of the system
as well as the path of networking.firewall.extraCommands.</p>
<p><strong>Type:</strong> <code>list of package</code></p>
<h3 id="default_12" networking-firewall-extraPackages-default="networking-firewall-extraPackages-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_9" networking-firewall-extraPackages-example="networking-firewall-extraPackages-example">Example</h3>
<p><code class="highlight"><span class="p">[</span> pkgs<span class="o">.</span>ipset <span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallextrareversepathfilterrules" networking-firewall-extraReversePathFilterRules="networking-firewall-extraReversePathFilterRules"><code>networking.firewall.extraReversePathFilterRules</code></h2>
<p>Additional nftables rules to be appended to the rpfilter-allow
chain.</p>
<p>This option only works with the nftables based firewall.</p>
<p><strong>Type:</strong> <code>strings concatenated with "\n"</code></p>
<h3 id="default_13" networking-firewall-extraReversePathFilterRules-default="networking-firewall-extraReversePathFilterRules-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;&quot;</span></code></p>
<h3 id="example_10" networking-firewall-extraReversePathFilterRules-example="networking-firewall-extraReversePathFilterRules-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;fib daddr . mark . iif type local accept&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-nftables.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-nftables.nix</a></p>
<h2 id="networkingfirewallextrastopcommands" networking-firewall-extraStopCommands="networking-firewall-extraStopCommands"><code>networking.firewall.extraStopCommands</code></h2>
<p>Additional shell commands executed as part of the firewall
shutdown script. These are executed just after the removal
of the NixOS input rule, or if the service enters a failed
state.</p>
<p>This option only works with the iptables based firewall.</p>
<p><strong>Type:</strong> <code>strings concatenated with "\n"</code></p>
<h3 id="default_14" networking-firewall-extraStopCommands-default="networking-firewall-extraStopCommands-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;&quot;</span></code></p>
<h3 id="example_11" networking-firewall-extraStopCommands-example="networking-firewall-extraStopCommands-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;iptables -P INPUT ACCEPT&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-iptables.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall-iptables.nix</a></p>
<h2 id="networkingfirewallfilterforward" networking-firewall-filterForward="networking-firewall-filterForward"><code>networking.firewall.filterForward</code></h2>
<p>Enable filtering in IP forwarding.</p>
<p>This option only works with the nftables based firewall.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_15" networking-firewall-filterForward-default="networking-firewall-filterForward-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallinterfaces" networking-firewall-interfaces="networking-firewall-interfaces"><code>networking.firewall.interfaces</code></h2>
<p>Interface-specific open ports.</p>
<p><strong>Type:</strong> <code>attribute set of (submodule)</code></p>
<h3 id="default_16" networking-firewall-interfaces-default="networking-firewall-interfaces-default">Default</h3>
<p><code class="highlight"><span class="p">{</span> <span class="p">}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallinterfacesnameallowedtcpportranges" networking-firewall-interfaces-_wzxhzdk:64_-allowedTCPPortRanges="networking-firewall-interfaces-<name>-allowedTCPPortRanges"><code>networking.firewall.interfaces.&lt;name&gt;.allowedTCPPortRanges</code></h2>
<p>A range of TCP ports on which incoming connections are
accepted.</p>
<p><strong>Type:</strong> <code>list of attribute set of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_17" networking-firewall-interfaces-_wzxhzdk:66_-allowedTCPPortRanges-default="networking-firewall-interfaces-<name>-allowedTCPPortRanges-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_12" networking-firewall-interfaces-_wzxhzdk:68_-allowedTCPPortRanges-example="networking-firewall-interfaces-<name>-allowedTCPPortRanges-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="p">{</span><span class="ss">from</span> <span class="o">=</span> <span class="mi">8999</span><span class="p">;</span><span class="ss">to</span> <span class="o">=</span> <span class="mi">9003</span><span class="p">;</span><span class="p">}</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallinterfacesnameallowedtcpports" networking-firewall-interfaces-_wzxhzdk:71_-allowedTCPPorts="networking-firewall-interfaces-<name>-allowedTCPPorts"><code>networking.firewall.interfaces.&lt;name&gt;.allowedTCPPorts</code></h2>
<p>List of TCP ports on which incoming connections are
accepted.</p>
<p><strong>Type:</strong> <code>list of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_18" networking-firewall-interfaces-_wzxhzdk:73_-allowedTCPPorts-default="networking-firewall-interfaces-<name>-allowedTCPPorts-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_13" networking-firewall-interfaces-_wzxhzdk:75_-allowedTCPPorts-example="networking-firewall-interfaces-<name>-allowedTCPPorts-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="mi">22</span><span class="mi">80</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallinterfacesnameallowedudpportranges" networking-firewall-interfaces-_wzxhzdk:78_-allowedUDPPortRanges="networking-firewall-interfaces-<name>-allowedUDPPortRanges"><code>networking.firewall.interfaces.&lt;name&gt;.allowedUDPPortRanges</code></h2>
<p>Range of open UDP ports.</p>
<p><strong>Type:</strong> <code>list of attribute set of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_19" networking-firewall-interfaces-_wzxhzdk:80_-allowedUDPPortRanges-default="networking-firewall-interfaces-<name>-allowedUDPPortRanges-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_14" networking-firewall-interfaces-_wzxhzdk:82_-allowedUDPPortRanges-example="networking-firewall-interfaces-<name>-allowedUDPPortRanges-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="p">{</span><span class="ss">from</span> <span class="o">=</span> <span class="mi">60000</span><span class="p">;</span><span class="ss">to</span> <span class="o">=</span> <span class="mi">61000</span><span class="p">;</span><span class="p">}</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallinterfacesnameallowedudpports" networking-firewall-interfaces-_wzxhzdk:85_-allowedUDPPorts="networking-firewall-interfaces-<name>-allowedUDPPorts"><code>networking.firewall.interfaces.&lt;name&gt;.allowedUDPPorts</code></h2>
<p>List of open UDP ports.</p>
<p><strong>Type:</strong> <code>list of 16 bit unsigned integer; between 0 and 65535 (both inclusive)</code></p>
<h3 id="default_20" networking-firewall-interfaces-_wzxhzdk:87_-allowedUDPPorts-default="networking-firewall-interfaces-<name>-allowedUDPPorts-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_15" networking-firewall-interfaces-_wzxhzdk:89_-allowedUDPPorts-example="networking-firewall-interfaces-<name>-allowedUDPPorts-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="mi">53</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewalllogrefusedconnections" networking-firewall-logRefusedConnections="networking-firewall-logRefusedConnections"><code>networking.firewall.logRefusedConnections</code></h2>
<p>Whether to log rejected or dropped incoming connections.
Note: The logs are found in the kernel logs, i.e. dmesg
or journalctl -k.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_21" networking-firewall-logRefusedConnections-default="networking-firewall-logRefusedConnections-default">Default</h3>
<p><code class="highlight"><span class="no">true</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewalllogrefusedpackets" networking-firewall-logRefusedPackets="networking-firewall-logRefusedPackets"><code>networking.firewall.logRefusedPackets</code></h2>
<p>Whether to log all rejected or dropped incoming packets.
This tends to give a lot of log messages, so it's mostly
useful for debugging.
Note: The logs are found in the kernel logs, i.e. dmesg
or journalctl -k.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_22" networking-firewall-logRefusedPackets-default="networking-firewall-logRefusedPackets-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewalllogrefusedunicastsonly" networking-firewall-logRefusedUnicastsOnly="networking-firewall-logRefusedUnicastsOnly"><code>networking.firewall.logRefusedUnicastsOnly</code></h2>
<p>If {option}<code>networking.firewall.logRefusedPackets</code>
and this option are enabled, then only log packets
specifically directed at this machine, i.e., not broadcasts
or multicasts.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_23" networking-firewall-logRefusedUnicastsOnly-default="networking-firewall-logRefusedUnicastsOnly-default">Default</h3>
<p><code class="highlight"><span class="no">true</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewalllogreversepathdrops" networking-firewall-logReversePathDrops="networking-firewall-logReversePathDrops"><code>networking.firewall.logReversePathDrops</code></h2>
<p>Logs dropped packets failing the reverse path filter test if
the option networking.firewall.checkReversePath is enabled.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_24" networking-firewall-logReversePathDrops-default="networking-firewall-logReversePathDrops-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallpackage" networking-firewall-package="networking-firewall-package"><code>networking.firewall.package</code></h2>
<p>The package to use for running the firewall service.</p>
<p><strong>Type:</strong> <code>package</code></p>
<h3 id="default_25" networking-firewall-package-default="networking-firewall-package-default">Default</h3>
<p><code class="highlight"><span class="k">if</span> config<span class="o">.</span>networking<span class="o">.</span>nftables<span class="o">.</span>enable <span class="k">then</span> <span class="s2">&quot;pkgs.nftables&quot;</span> <span class="k">else</span> <span class="s2">&quot;pkgs.iptables&quot;</span></code></p>
<h3 id="example_16" networking-firewall-package-example="networking-firewall-package-example">Example</h3>
<p><code class="highlight">pkgs<span class="o">.</span>iptables-legacy</code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallpinglimit" networking-firewall-pingLimit="networking-firewall-pingLimit"><code>networking.firewall.pingLimit</code></h2>
<p>If pings are allowed, this allows setting rate limits on them.</p>
<p>For the iptables based firewall, it should be set like
"--limit 1/minute --limit-burst 5".</p>
<p>For the nftables based firewall, it should be set like
"2/second" or "1/minute burst 5 packets".</p>
<p><strong>Type:</strong> <code>null or strings concatenated with " "</code></p>
<h3 id="default_26" networking-firewall-pingLimit-default="networking-firewall-pingLimit-default">Default</h3>
<p><code class="highlight"><span class="no">null</span></code></p>
<h3 id="example_17" networking-firewall-pingLimit-example="networking-firewall-pingLimit-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;--limit 1/minute --limit-burst 5&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewallrejectpackets" networking-firewall-rejectPackets="networking-firewall-rejectPackets"><code>networking.firewall.rejectPackets</code></h2>
<p>If set, refused packets are rejected rather than dropped
(ignored). This means that an ICMP "port unreachable" error
message is sent back to the client (or a TCP RST packet in
case of an existing connection). Rejecting packets makes
port scanning somewhat easier.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_27" networking-firewall-rejectPackets-default="networking-firewall-rejectPackets-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
<h2 id="networkingfirewalltrustedinterfaces" networking-firewall-trustedInterfaces="networking-firewall-trustedInterfaces"><code>networking.firewall.trustedInterfaces</code></h2>
<p>Traffic coming in from these interfaces will be accepted
unconditionally. Traffic from the loopback (lo) interface
will always be accepted.</p>
<p><strong>Type:</strong> <code>list of string</code></p>
<h3 id="default_28" networking-firewall-trustedInterfaces-default="networking-firewall-trustedInterfaces-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_18" networking-firewall-trustedInterfaces-example="networking-firewall-trustedInterfaces-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="s2">&quot;enp0s2&quot;</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/services/networking/firewall.nix</a></p>
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