<para>The maximum transmission unit in bytes to
set for the device. The usual suffixes K, M, G,
are supported and are understood to the base of
- 1024.</para>
+ 1024. This key is not currently suported for
+ <literal>tun</literal> or <literal>tap</literal> devices.
+ </para>
</listitem>
</varlistentry>
<varlistentry>
If none is given, one is generated based on
the interface name and the
<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ This key is not currently suported for <literal>tun</literal> or <literal>tap</literal> devices.
</para>
</listitem>
</varlistentry>
to discover remote MAC addresses.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>FDBAgeingSec=</varname></term>
+ <listitem>
+ <para>The lifetime of Forwarding Database entry learnt by the kernel in seconds.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>ARPProxy=</varname></term>
+ <listitem>
+ <para>A boolean. When true, enables ARP proxy.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>L2MissNotification=</varname></term>
+ <listitem>
+ <para>A boolean. When true, enables netlink LLADDR miss notifications.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>L3MissNotification=</varname></term>
+ <listitem>
+ <para>A boolean. When true, enables netlink IP ADDR miss notifications.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>RouteShortCircuit=</varname></term>
+ <listitem>
+ <para>A boolean. When true route short circuit is turned on.</para>
+ </listitem>
+ </varlistentry>
</variablelist>
</refsect1>
<refsect1>
The default value is <literal>slow</literal>.</para>
</listitem>
</varlistentry>
+
+ <varlistentry>
+ <term><varname>MIIMonitorSec=</varname></term>
+ <listitem>
+ <para>Specifies the frequency that Media Independent Interface link
+ monitoring will occur. A value of zero disables MII link monitoring.
+ This values is rounded down to the nearest millisecond. The default
+ value is 0.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>UpDelaySec=</varname></term>
+ <listitem>
+ <para>Specifies the delay before a link is enabled after a link up
+ status has been detected. This value is rounded down to a multiple of
+ MIIMonitorSec. The default value is 0.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>DownDelaySec=</varname></term>
+ <listitem>
+ <para>Specifies the delay before a link is disabled after a link down
+ status has been detected. This value is rounded down to a multiple of
+ MIIMonitorSec. The default value is 0.</para>
+ </listitem>
+ </varlistentry>
+
</variablelist>
</refsect1>