Just for the googlers in the house, Red Hat’s PPP DialupServer Quick Setup Tips got me up and running a PPP server on my Linux box so I could act as a free ISP to my friend who is in town on winter break. I used the directions to get everything up and running on a Red Hat 7.2 box, though I’m sure it would work on 7.3, 8.0, or (somewhat) earlier versions. We’re talking less than 10 minutes from figuring out which tty my modem was to having everything set up and ready to rock.