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networkd: Add docs and tests for IPv4SrcValidMark=

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Document the new setting in systemd.network(5) man page
and add coverage in the networkd integration tests.

Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
ssahani
2026-03-30 06:25:00 +05:30
committed by Susant Sahani
parent 1fcb88b234
commit 2f69c8e712
4 changed files with 16 additions and 0 deletions
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man/systemd.network.xml
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@@ -1086,6 +1086,19 @@ DuplicateAddressDetection=none</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPv4SrcValidMark=</varname></term>
<listitem>
<para>Takes a boolean. When enabled, the packet's firewall mark (fwmark) is included in the
reverse path filter route lookup for source address validation on this interface. This is
particularly useful for policy routing setups where packets may arrive with source addresses
that are only valid in routing tables selected by their fwmark. When unset, the kernel's
default will be used.</para>
<xi:include href="version-info.xml" xpointer="v261"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPv4ProxyARP=</varname></term>
<listitem>