Change IP Addresses
 

I would like to know where do I go to change IP addresses? I do not have Linux 9.1 manual. I think it is in Linux Network Configuration section, but I could be wrong.

try running

redhat-config-network

as root from a terminal.
good luck.

You can do it the same way I suggested for your default route - run "netconfig".

Also there is no such thing as RedHat 9.1 as RedHat have discontinued that distro as of version 9. The manual for it can be found at:
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/

At the prompt type :-

ifconfig eth0 10.0.0.1 netmask 255.255.255.0 up

Assuming you are configuring your eth0 card, replace it accordingly if there are more than one nic in the machine.

The "up" at the end of the command activates the interface. To make this permanent each time you boot up you'll have to add this command in your /etc/rc.d/rc.local file.