nothing is done. Otherwise, a new MAC address is
generated which is guaranteed to be the same on every
boot for the given machine and the given device, but
- which is otherwise random.</para>
+ which is otherwise random. This feature depends on ID_NET_NAME_*
+ properties existing for the link, on hardware where these
+ properties are not set the generation of a persistent mac address
+ will fail.</para>
</listitem>
</varlistentry>
<varlistentry>