VPS Gateway and Host

Hi,

I've a question on how to best use IP Failover and Gateway when I move VPS from one host to another host.
Which is the best solution to config VPS with an IP failover, so when I move it to another host, I don't need to reconfig NIC?
The good thing is that the two host have the same gateway, but this is not always possible.
I use Proxmox 2.2 and VPS use vmbr0.

Thanks:confused: