root@test-instance-1:/# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address 10.0.2.16
        netmask 255.255.255.0
        broadcast 10.0.2.255
        gateway 10.0.2.2


auto eth1
iface eth1 inet static
        address 10.0.4.16
        netmask 255.255.255.0
        broadcast 10.0.4.255
        gateway 10.0.2.2



root@test-instance-1:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.4.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
10.0.2.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         10.0.2.2        0.0.0.0         UG    100    0        0 eth0
root@test-instance-1:/#