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man: extend documentation on IPForward= and IPMasquerade= 

Mention the default values, and clarify how this relates to the
underlying sysctls.
This commit is contained in:
Lennart Poettering 2015-04-24 19:53:38 +02:00
parent e2f8d97a13
commit 4046d8361c
1 changed files with 20 additions and 2 deletions
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22
man/systemd.network.xml
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@ -358,7 +358,24 @@
the routing table. Takes either a boolean argument, or the
values <literal>ipv4</literal> or <literal>ipv6</literal>,
which only enables IP forwarding for the specified address
family.</para></listitem>
family. This controls the
<filename>net.ipv4.conf.&lt;interface&gt;.forwarding</filename>
and
<filename>net.ipv6.conf.&lt;interface&gt;.forwarding</filename>
sysctl options of the network interface (see <ulink
url="https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt">ip-sysctl.txt</ulink>
for details about sysctl options). Defaults to
<literal>no</literal>.</para>
<para>Note: unless this option is turned on, no IP
forwarding is done on this interface, even if this is
globally turned on in the kernel, with the
<filename>net.ipv4.ip_forward</filename> and
<filename>net.ipv4.ip_forward</filename> sysctl
options. Also, if this option is enabled for at least one
interface, the global options in the kernel are also enabled
as necessary, to ensure IP forwarding can take place.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPMasquerade=</varname></term>
@ -366,7 +383,8 @@
interface. If enabled packets forwarded from the network
interface will be appear as coming from the local host.
Takes a boolean argument. Implies
<varname>IPForward=yes</varname>.</para></listitem>
<varname>IPForward=yes</varname>. Defaults to
<literal>no</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>Bridge=</varname></term>