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network/netdev: make MACAddress= take 'none' to suppress generating persistent hardware address

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This is mostly equivalent to .link file's MACAddressPolicy=none.
This commit is contained in:
Yu Watanabe
2021-11-28 12:04:55 +09:00
parent 5dcc5b1a11
commit aaa5ca57ae
5 changed files with 46 additions and 7 deletions
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man/systemd.netdev.xml
+10 -3
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@@ -254,9 +254,12 @@
<varlistentry>
<term><varname>MACAddress=</varname></term>
<listitem>
<para>The MAC address to use for the device. For <literal>tun</literal> or <literal>tap</literal>
devices, setting <varname>MACAddress=</varname> in the [NetDev] section is not
supported. Please specify it in the [Link] section of the corresponding
<para>Specifies the MAC address to use for the device, or takes the special value
<literal>none</literal>. When <literal>none</literal>, <command>systemd-networkd</command>
does not request the MAC address for the device, and the kernel will assign a random MAC
address. For <literal>tun</literal>, <literal>tap</literal>, or <literal>l2tp</literal>
devices, the <varname>MACAddress=</varname> setting in the [NetDev] section is not
supported and will be ignored. Please specify it in the [Link] section of the corresponding
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
file. If this option is not set, <literal>bridge</literal> and <literal>vlan</literal> devices
inherit the MAC address of the first slave device or the physical interface, respectively. For other
@@ -264,6 +267,10 @@
name and the
<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
<para>Note, even if <literal>none</literal> is specified, <command>systemd-udevd</command>
will assign the persistent MAC address for the device, as <filename>99-default.link</filename>
has <varname>MACAddressPolicy=persistent</varname>. So, it is also necessary to create a
custom .link file for the device, if the MAC address assignment is not desired.</para>
</listitem>
</varlistentry>
</variablelist>