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man/network: extend document about the default value of IPv6AcceptRA=

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Prompted by #39304.
This commit is contained in:
Yu Watanabe
2025-10-22 02:52:28 +09:00
parent a5962d3327
commit cc7ccd3c6a
1 changed files with 15 additions and 5 deletions
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20
man/systemd.network.xml
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@@ -215,7 +215,8 @@
<term><varname>Multicast=</varname></term>
<listitem>
<para>Takes a boolean. If set to true, the multicast flag on the device is enabled. Defaults
to unset.</para>
to unset and the flag is unchanged. When disabled, <varname>IPv6AcceptRA=</varname> and
<varname>IPv6SendRA=</varname> cannot be enabled.</para>
<xi:include href="version-info.xml" xpointer="v239"/>
</listitem>
@@ -942,10 +943,19 @@ DuplicateAddressDetection=none</programlisting></para>
<para>Takes a boolean. Controls IPv6 Router Advertisement (RA) reception support for the interface.
If true, RAs are accepted; if false, RAs are ignored. When RAs are accepted, they may trigger the
start of the DHCPv6 client if the relevant flags are set in the RA data, or if no routers are found
on the link. Defaults to false for bridge devices, when <varname>IPv6Forwarding=</varname>,
<varname>IPv6SendRA=</varname>, or <varname>KeepMaster=</varname> is enabled. Otherwise, enabled by
default. Cannot be enabled on devices aggregated in a bond device or when link-local addressing is
disabled.</para>
on the link.</para>
<para>This cannot be enabled on devices aggregated in a bond device, or when IPv6 link-local
addressing (see <varname>LinkLocalAddressing=</varname>) or multicasting (see
<varname>Multicast=</varname>) is disabled. Note, multicasting is disabled by default for some
configurations, e.g. bridge ports. Hence, in that case <varname>Multicast=</varname> needs to be
explicitly enabled to make this feature usable. When <varname>IPv6SendRA=</varname>,
<varname>IPv6Forwarding=</varname>, or <varname>IPMasquerade=</varname> is enabled, this feature is
disabled by default, but can be overridden by explicitly enabling this setting. Note,
<varname>IPv6Forwarding=</varname> may be indirectly enabled when the global setting with the same
name is enabled, or when <varname>IPMasquerade=</varname> is enabled on <emphasis>any other
interfaces</emphasis>. See also <varname>IPv6Forwarding=</varname> and
<varname>IPMasquerade=</varname> for more details. Enabled by default otherwise.</para>
<para>Further settings for the IPv6 RA support may be configured in the [IPv6AcceptRA]
section, see below.</para>