Debian / Ubuntu Linux Setting a Default Gateway

Looking for a Linux command to change / set new default Gateway and I found just what I need at http://www.cyberciti.biz.... by the ever famous NIXCRAFT!!! Thanks a lot! Here are the commands:

Q. How do I setup a default gateway on Debian or Ubuntu Linux? My router IP is 192.168.1.254 and I'd like to setup this as a default gateway for Debian Linux.

A. You can use command line tool such as
a] ip command - show / manipulate routing, devices, policy routing and tunnels
b] route command - show / manipulate the IP routing table
c] Save routing information to a configuration file so that after reboot you get same default gateway.

ip command to set a default router to 192.168.1.254

Login as the root and type: # ip route add default via 192.168.1.254
OR $ sudo ip route add default via 192.168.1.254

route command to set a default router to 192.168.1.254

Login as the root and type: # route add default gw 192.168.1.254
OR $ sudo route add default gw 192.168.1.254

Save routing information to a configuration file /etc/network/interfaces

Open /etc/network/interfaces file # vi /etc/network/interfaces
OR $ sudo vi /etc/network/interfaces
Find eth0 or desired network interface and add following option gateway 192.168.1.254
Save and close the file. Restart networking: # /etc/init.d/networking restart
OR $ sudo /etc/init.d/networking restart