...
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = lxcbr0
lxc.network.name = eth0
lxc.network.hwaddr = 00:16:3e:a3:23:1d //l'adresse MAC vous l'inventez bien entendu
lxc.network.mtu = 1500
...