Getting new sh*t around the block, having new roots at OVH, cool offers, nice machines, decent services, okay price, worst UI for management webinterface ever :_)

first, get two of your 3 failover IPs and attach them to your rootserver.

to get xen bridged running you need to create virtual mac addresses in the ovh manager. assign those to the vif section of the domU config:

vif         = [ 'ip=1.3.3.7,mac=02:00:00:00:00:01,vifname=vif.serv01',
                'ip=1.3.3.8,mac=02:00:00:00:00:02,vifname=vif.serv02' ]

use in xend-config.sxp

(network-script 'network-bridge antispoof=yes')
(vif-script vif-bridge)

and in domU /etc/network/interfaces easy as this:

auto eth0
iface eth0 inet static
    address 1.3.3.7
    netmask 255.255.255.255
    broadcast 1.3.3.7
    post-up /sbin/ip route add default dev eth0

auto eth1
iface eth1 inet static
    address 1.3.3.8
    netmask 255.255.255.255
    broadcast 1.3.3.8
    post-up /sbin/ip rule add from 1.3.3.8 lookup 100
    post-up /sbin/ip route add default dev eth1 table 100