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man: document which IP ports resolved listens on, and what for
Fixes: #23045
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@ -442,6 +442,27 @@ search foobar.com barbar.com
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</variablelist>
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</refsect1>
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<refsect1>
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<title>IP Ports</title>
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<para>The <command>systemd-resolved</command> service listens on the following IP ports:</para>
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<itemizedlist>
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<listitem><para>Port 53 on IPv4 addresses 127.0.0.53 and 127.0.0.54 (both are on the local loopback
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interface <literal>lo</literal>). This is the local DNS stub, as discussed above. Both UDP and TCP are
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covered.</para></listitem>
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<listitem><para>Port 5353 on all local addresses, both IPv4 and IPv6 (0.0.0.0 and ::0), for
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MulticastDNS on UDP. Note that even though the socket is bound to all local interfaces via the selected
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"wildcard" IP addresses, the incoming datagrams are filtered by the network interface they are coming
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in on, and separate MulticastDNS link-local scopes are maintained for each, taking into consideration
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whether MulticastDNS is enabled for the interface or not.</para></listitem>
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<listitem><para>Port 5355 on all local addresses, both IPv4 and IP6 (0.0.0.0 and ::0), for LLMNR, on
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both TCP and UDP. As with MulticastDNS filtering by incoming network interface is applied.</para></listitem>
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</itemizedlist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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