Bernie
Go to http://www.redhat.com/ click on downloads and rpm updates click on internet and download a lan connection program. lisa 3 something. If your router is connected to your isp a lan connection is all you should need.
For pppoe software go to http://www.roaringpenguin.com/pppoe/ Read their install guide and problem solver and free download if needed.
You can use package manager to install the rpm which is a short download and should be all you need.
Richard