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man: mention that IPMasquerade= and IPv6SendRA= implies IPv4Forwarding=/IPv6Forwarding=

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It has been mentioned in IPv4Forwarding= and IPv6Forwarding=,
but let's also explain in the settings who imply these settings.

Follow-up for 3976c43092 and
485f5148b3.
This commit is contained in:
Yu Watanabe 2024-05-30 12:44:07 +09:00 committed by Luca Boccassi
parent 214013be83
commit d24ceef937
1 changed files with 17 additions and 5 deletions
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22
man/systemd.network.xml
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@ -866,11 +866,20 @@ Table=1234</programlisting></para>
<term><varname>IPMasquerade=</varname></term>
<listitem>
<para>Configures IP masquerading for the network interface. If enabled, packets forwarded
from the network interface will be appear as coming from the local host. Takes one of
<literal>ipv4</literal>, <literal>ipv6</literal>, <literal>both</literal>, or
<literal>no</literal>. Defaults to <literal>no</literal>.</para>
<para>Note. Any positive boolean values such as <literal>yes</literal> or
<literal>true</literal> are now deprecated. Please use one of the values above.</para>
from the network interface will be appear as coming from the local host. Typically, this should be
enabled on the downstream interface of routers. Takes one of <literal>ipv4</literal>,
<literal>ipv6</literal>, <literal>both</literal>, or <literal>no</literal>. Defaults to
<literal>no</literal>. Note. Any positive boolean values such as <literal>yes</literal> or
<literal>true</literal> are now deprecated. Please use one of the values above. Specifying
<literal>ipv4</literal> or <literal>both</literal> implies <varname>IPv4Forwarding=</varname>,
unless it is explicitly specified. Similary for <varname>IPv6Forwarding=</varname> when
<literal>ipv6</literal> or <literal>both</literal> is specified. These implications are only on
this interface. Hence, to make the IP packet forwarding works,
<varname>IPv4Forwarding=</varname>/<varname>IPv6Forwarding=</varname> need to be enabled on an
upstream interface, or globally enabled by specifying them in
<citerefentry><refentrytitle>networkd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
See <varname>IPv4Forwarding=</varname>/<varname>IPv6Forwarding=</varname> in the above for more
details.</para>
<xi:include href="version-info.xml" xpointer="v219"/>
</listitem>
@ -1068,6 +1077,9 @@ Table=1234</programlisting></para>
distributed. See <varname>DHCPPrefixDelegation=</varname> setting and the [IPv6SendRA],
[IPv6Prefix], [IPv6RoutePrefix], and [DHCPPrefixDelegation] sections for more configuration
options.</para>
<para>If enabled, <varname>IPv6Forwarding=</varname> on this interface is also enabled, unless
the setting is explicitly specified. See <varname>IPv6Forwarding=</varname> in the above for more
details.</para>
<xi:include href="version-info.xml" xpointer="v247"/>
</listitem>