I would like to know what version of Red Hat is that.If you are new to Linux open a program called console or terminal then type
su - and enter your root (admin's) password and hit enter,then
cd /etc and then
cat /etc/modules.conf or if that command doesn't work use this
cat /etc/conf.modules and post the output here.Also post the output of
/sbin/lsmod command here.Maybe you just have to enter correct data for your interface.Try with
netcfg command.Did you tried any GUI application in Red Hat for network configuration?Also have a look here;
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-guide/ch-network-config.html