Failover IP (again)

[Xela]

Hi there, after endless attempts, I turn to you.

auto eth2
iface eth2 inet manual

auto vmbr0
iface vmbr0 inet static
address 1xx.2xx.3xx.4xx
netmask 255.255.255.0
gateway 1xx.2xx.3xx.254
broadcast 1xx.2xx.3xx.255
bridge_ports eth2
bridge_stp off
bridge_fd 0
network 1xx.2xx.3xx.0

Works well on the host, but adding a vmbr1 fails:

auto vmbr1
iface vmbr1 inet static
address 1zz.2zz.3zz.4zz # FO IP
netmask 255.255.255.255 # 1 specific
broadcast 1zz.2zz.3zz.4zz # FO IP
post-up route add 1xx.2xx.3xx.254 dev eth2
post-up route add default gw 1xx.2xx.3xx.254
post-down route del default gw 1xx.2xx.3xx.254
post-down route del 1xx.2xx.3xx.254 dev eth2

Any recommendation is welcome.

 

[Xela]

OK, new trial with a new VM (https://docs.ovh.com/gb/en/dedicated/network-bridging/):
VM (2016 eval), Bridged mode vmbr0, MAC xx:xx:xx:xx:xx:xx (from OVH FO IP), eth2

auto eth2
iface eth2 inet manual

auto vmbr0
iface vmbr0 inet static
address 1xx.2xx.3xx.4xx
netmask 255.255.255.0
gateway 1xx.2xx.3xx.254
broadcast 1xx.2xx.3xx.255
bridge_ports eth2
bridge_stp off
bridge_fd 0
network 1xx.2xx.3xx.0
mtu 1450

In VM (2016), APIPA deactivated in Registry (https://social.technet.microsoft.co...le-autoconfiguration-ipv4-?forum=winserverNIS):

IP: 1zz.2zz.3zz.4zz (Failover IP)
SM: 255.255.255.255
D GW: 1xx.2xx.3xx.254
DNS: 213.186.33.99

But the NIC of the VM shows now 'Media disconnected'.
What did I forget?