I would like to have multiple NICs (eth0 and wlan0) in the same subnet and to serve as a backup for the applications on the host if one of the NICs fail. For this reason I have created an additional routing table. This is how /etc/network/interfaces looks: iface eth0 inet static address 192.168.178.2 netmask 255.255.255.0 dns-nameserver 8.8.8.8 8.8.4.4 post-up ip route add 192.168.178.0/24 dev eth