Xen users - Sep 2005 - RE: Fixed MAC address causes spurios network connectivity loss - SOLVED.

> > Are you sure some other machine on your network isn''t also 
> > using that MAC?
> 
> I am quite confident since I had no problems running the VM 
> as a VMware guest with that same MAC. I''ll however admit that 
> it sounds too probable for comfort, so I''ll try booting the 
> VMware thing up again just to double-check that it does not 
> have the problem. I could also just try another fixed MAC to test it.
Bingo. Tried to switch to another MAC. Did a continous ping from another
Linux box (not on the Xen server but on the same subnet):

  vif = [''mac=00:50:56:00:00:0A''] => 1900 packets without
loss

  vif = [''mac=00:50:56:00:00:01''] => 796 packets trmd, 716
packets rcvd,
10% packet loss

So in the first case I can ping for half an hour with perfect
reliability. In the second case I have noticeable packet loss after only
10 minutes.

I think it is safe to conclude that Xen is off the hook and that I''ll
have to find the cause of my trouble elsewhere in our network.

Thanks for your input!

Cheers
-- Jan Holst Jensen, Novo Nordisk A/S, Denmark

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