New to Linux

Hi I am using Red hat 9, I am pretty new to Linux field. Can someone suggest me how show I be proceeding so that I can use EAP authentication, for the user connected to my switch. I am very much familiar with the configuration on the switch. It would be helpful if some one can send me a link or doc that could help me to proceed further. Warm Regards Chaitanya Nortel Certified Support Specialist GNTS-Nortel E:mail::mchaitan@nortel.com Working Hours :: 8 - 5 EST Phone :: 800 4NORTEL (667 835) option 1 # ERC then Case number