I don't know if this would help since I have cable, not DSL, but a man -k DSL on ubuntu 6.06 pointed me at:
PPPOECONF(8)                                                      PPPOECONF(8)

NAME
       pppoeconf — configures a PPPoE (ADSL) connection

SYNOPSIS
       pppoeconf

DESCRIPTION
       The pppoeconf program is userfriendly dialog based setup tool for pppoe
       and pppd. It will look for existing ethernet cards and look for ADSL
       hardware connected to one of them. Then it will get some login info and
       do some minor modification to make working settings.

SEE ALSO
       pppoe (8), pppd (8).

AUTHOR
       This manual page was written by Eduard Bloch blad@debian.org for the
       Debian GNU/Linux system (but may be used by others). Permission is
       granted to copy, distribute and/or modify this document under the terms
       of the GNU Free Documentation License, Version 1.1 or any later version
       published by the Free Software Foundation; with no Invariant Sections,
       no Front-Cover Texts and no Back-Cover Texts.

                                                                  PPPOECONF(8)

On 11/6/06, JT Moree < moreejt@pcxperience.com> wrote: