(network-script network-route) (vif-script vif-route)
echo 'echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp' >> /etc/xen/scripts/network-route
vif = [ 'ip=mon_adresse_ip_failover' ] netmask = "255.255.255.0" gateway = "ADDR_IP_MACHINE_HOTE"
auto eth0 iface eth0 inet static address mon_adresse_ip_failover netmask 255.255.255.255 post-up /sbin/ip route add ADDR_IP_MACHINE_HOTE/32 dev eth0 post-up /sbin/ip route add default via ADDR_IP_MACHINE_HOTE