SSH and log onto the host and elevate your privileges using
su -l
Enter the password when prompted
Enter below command to open the network config file
vi /etc/sysconfig/network
Press i to enter insert mode
Change the default gateway as needed
Press ESC to exit insert mode
Enter :wq to save and quit (if you want to quit without saving changes you would use :q!)
Restart the network server by entering
service network restart
Note: You will loose connection to the service console while the network service is restarting
Great, thanks!!!!!