Hi,
Try running "redhat-config-services" in su mode. The "kudzu" service should be started automatically, this will detect ur eth0 (Ethernet card) automatically. If its already detected.. do step 2
step 2: run redhat-config-network, in su (super user) mode. this will show the Network Device Control Window. Click the Configure button.
In the new configure window,
Double Click on the Device listed in the Device Tab, You can find a check box, "Activate device when computer starts" thats all you have done...
Have a nice time,