Change the following 2 files
1) /etc/network/interfaces
2) /etc/resolv.conf
Steps
1) sudo vi /etc/network/interfaces
The followings will be seen.
auto eth0
iface eth0 inet dhcp
change to
auto eth0
iface eth0 inet static
address 192.168.0.2
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.1
2) sudo vi /etc/resolv.conf
change to
name server 192.168.0.1
name server 8.8.8.8 (optional, this is google’s public DNS)
3) Restart networking
sudo /etc/init.d/networking restart
if fails, use the followings to disable & enable the network card
sudo ifdown eth0
sudo ifup eth0
or just combine the above 2 commands especially when you are not at the console
sudo ifdown eth0 && sudo ifup eth0