Have u checked the dhcp deamon is running ?
/etc/rc.d/init.d/dhcp status (or dhcpd status, don't remember)
yet, be aware that getting online with linux involves more than just that.
configuring network is quite tricky with linux...
neway, u should be able to get full information on redHat network :
http://www.europe.redhat.com/documen...-9/ch-ppp.php3 (getting online documentation)
php/java developer
NTIC engineer