^^ I am using ADSL with USB but in ubuntu from the last september. No problems till now.
@asdfgh2: Assuming that the basic linux are all same. Use this script:
Make a new file anywhere (on the desktop maybe)
[Desktop Entry]
Name=RP-PPPoE
Comment=RP-PPPoE
Exec=gksudo /opt/rp-pppoe-3.6/go-gui
Icon=pppoeconf.xpm
Terminal=false
Type=Application
Categories=Application;Network;
SAve the file and click on it.
Run: Applications -> Internet -> RP-PPPoE
THis worked fine in ubuntu 6.06. I cont guarantee that this will work fine in RH. Anyways Best Of Luck.