auto eth0iface eth0 inet manualiface eth0 inet6 manualauto vmbr0iface vmbr0 inet static address xxx.xxx.xxx.157/27 gateway xxx.xxx.xxx.129 bridge-ports eth0 bridge-stp off bridge-fd 0iface vmbr0 inet6 static address abcd:abcd:abcd:3400::1/64 gateway fe80::1 post-up sysctl -w net.ipv6.conf.all.forwarding=1 accept_ra 0 autoconf 0 privext 0 up ip route add abcd:abcd:abcd:3400::/56 via abcd:abcd:abcd:3400::2 dev vmbr0auto vmbr1iface vmbr1 inet manual bridge-ports none bridge-stp off bridge-fd 0 up ip route replace xxx.xxx.xxx.128/27 via xxx.xxx.xxx.129 dev vmbr0