(1) netstat -rn to check the kernel IP routing table. You’ll be seeing something like below:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
(2) sudo vi /etc/network/interfaces to set the following :
auto eth3
iface eth3 inet static
address xx
gateway yy
netmask aa
network bb
broadcast cc
(3) restart networking so that it’ll take effect
sudo /etc/init.d/networking restart
