networking hosed after upgrading to 10.04

[scar]

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compdoc @ 05/31/2011 11:53 AM:
>> my VM grabs an IP address but i noticed it is something like
>> 192.168.122.X which seems to correspond to the vibr0 interface
> 
> 
> You need to add a virtual nic to the VM that uses br0 as a source device.

ok well in my qemu XML config file i had

    <interface type='bridge'>
      <mac address='6e:16:64:86:7a:10'/>
      <source bridge='virbr0'/>

so i just changed that to br0 and that seems to have done the trick.
now what is virbr0?  that seems to be useless now, and it wasn't defined
in /e/n/i

still need to figure out why networking isn't starting/working
automatically upon system start...

thanks all

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