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man: document which IP ports resolved listens on, and what for

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Fixes: #23045
(cherry picked from commit bef84b81a4ac2dbb3069c8a705a0368516bb21c6)
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Lennart Poettering 2023-06-07 12:47:09 +02:00 committed by Luca Boccassi
parent b3bdd7efb8
commit b1c24b6f6f
1 changed files with 21 additions and 0 deletions
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man/systemd-resolved.service.xml
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@ -442,6 +442,27 @@ search foobar.com barbar.com
</variablelist>
</refsect1>
<refsect1>
<title>IP Ports</title>
<para>The <command>systemd-resolved</command> service listens on the following IP ports:</para>
<itemizedlist>
<listitem><para>Port 53 on IPv4 addresses 127.0.0.53 and 127.0.0.54 (both are on the local loopback
interface <literal>lo</literal>). This is the local DNS stub, as discussed above. Both UDP and TCP are
covered.</para></listitem>
<listitem><para>Port 5353 on all local addresses, both IPv4 and IPv6 (0.0.0.0 and ::0), for
MulticastDNS on UDP. Note that even though the socket is bound to all local interfaces via the selected
"wildcard" IP addresses, the incoming datagrams are filtered by the network interface they are coming
in on, and separate MulticastDNS link-local scopes are maintained for each, taking into consideration
whether MulticastDNS is enabled for the interface or not.</para></listitem>
<listitem><para>Port 5355 on all local addresses, both IPv4 and IP6 (0.0.0.0 and ::0), for LLMNR, on
both TCP and UDP. As with MulticastDNS filtering by incoming network interface is applied.</para></listitem>
</itemizedlist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>