You should only need to use these steps if you are using a modem supplied by your ISP, and not a router. The basic steps involved in manually setting up a DSL connection using Ubuntu involve connecting the proper hardware and then running a simple configuration script if you use
rp-pppoe from Roaring Penguin.
First, connect your DSL modem to your telephone line, and then plug in your Ethernet cable from the modem to your computer’s NIC. If you plan to share your DSL connection with the rest of your LAN, you need at least two network cards: designated
eth0 (for your LAN) and
eth1 (for the DSL connection).
The following example assumes that you have more than one computer and will share your DSL connection ...