> > Do you migrate your domU together with a fixed MAC address or is it 
> > chosen by xend?
>
> Yes I do move my DomU with a fixed MAC address.
> I want to make the package dropping period in the switch 
> between the two physical hosts as small as possible.
> Hence I would like to flush the forwarding cache in the 
> switch for this particular MAC address.
> If the DomU sens a package emidiately after its transfered 
> then the switch will be updated and packages send to it wont 
> be send to its old location.
> As you don't want to disturb the DomU for the transfer then 
> the package could be send from dom0 with the domU MAC address 
> as source.
This should already happen, at least it used to on 2.0. Might be worth
veryifying the code hasn't rotted.
We send an unsolicited arp reply, which works in both the case of moving
the MAC and of moving just the IP. (The source mac address of the packet
should cause the switch to reconfigure.)
Ian
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