[libvirt-users] virtual network bug?

[Gene Czarcinski]

On 09/03/2012 11:45 AM, Gene Czarcinski wrote:
> I have had a number of occasions lately where a virtual "NAT" network 
> (such as default) has stopped working.  I have attempted to stop and 
> then restart the network from the "network details" but the only thing 
> that seems to work is to restart all of the virtual guests which use 
> that network.  I don't believe that I should have to do that.  Is 
> there some command which will "fix" things?
>
> I have had this happen to me a number of times but I am currently 
> uncertain of the cause.  Anyone know what is going on?  I am not going 
> to bugzilla this until.
>
> I do know one way to cause the problem.  Disable the network in a 
> virtual machine.  Then using virt-manager's connection details menu, 
> stop that (default) network ... then start it up again. Everything 
> sort-of looks ok but it is not.  Go back to the virtual machine and 
> re-enable the previously disable network.  Nope ... cannot connect. 
> Start another virtual machine which uses that network and it works fine.
>
> In the "real world", I can disable a network, then remove a cable, 
> connect the cable back up, re-enable the network and everything works.
>
> BTW, NetworkManager is used in all cases.
>
> Any ideas?
>
I hate it when I answer my own questions!  OK, to get that virtual going 
again ... remove the NIC from the systems configuration, then add a NIC 
back making sure you keep the same MAC address ... now it works.  
Shouldn't there be a better way?

Gene