[libvirt] Another curiosity question

[Gene Czarcinski]

All doc and the libvirt software itself is very insistent that dhcp4 
will be supported on one and only one IPv4 subnetwork.  Why is true?

Certainly dnsmasq supports multiple  dhcp-range definitions and the 
actual parameters passed to dnsmasq would be more or less the same! I 
can understand some restriction if there were systems libvirt suports 
which does not support the multi-dhcp per interface but not the blanket 
restriction.

This, this is OK:
------------------------------------------------------
   <ip address='172.16.6.1' prefix='16'>
     <dhcp>
       <range start='172.16.6.128' end='172.16.6.254' />
       <range start='172.16.7.128' end='172.16.7.254' />
     </dhcp>
   </ip>
------------------------------------------------------
but this is not:
------------------------------------------------------
   <ip address='172.16.6.1' prefix='16'>
     <dhcp>
       <range start='172.16.6.128' end='172.16.6.254' />
       <range start='172.16.7.128' end='172.16.7.254' />
     </dhcp>
   </ip>
   <ip address='172.16.7.1' prefix='16'>
     <dhcp>
       <range start='172.16.7.128' end='172.16.7.254' />
     </dhcp>
   </ip>
------------------------------------------------------

In both cases, the parameters passed to dnsmasq are:
----------------------------------------------------
dhcp-range=172.16.6.128,172.16.6.254
dhcp-range=172.16.7.128,172.16.7.254
----------------------------------------------------
and, for dhcp, dnsmasq does not care about the specific addresses since 
it does its own filtering by listening on 0.0.0.0:67/68

Comments?

Gene