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Open /etc/network/interfaces file:

$ sudo vi /etc/network/interfaces

Set gateway using following syntax:

gateway {router-ip}

For example, set gateway to 192.168.1.254, enter:

gateway 192.168.1.254

At the end it should look like as follows:

iface eth0 inet static
address 192.168.1.1
netmask 255.255.255.0
gateway 192.168.1.254

Save and close the file. Restart networking:

$ sudo /etc/init.d/networking restart

Verify new routing is working, enter:

$ ping 192.168.1.254
$ route -n
$ host google.com

Source - http://www.cyberciti.biz/faq/ubuntu-linux-configure-gateway-ip/

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