>The PPPoE client at http://www.roaringpenguin.com/ (which is highly
>regarded in Linux circles) claims to have xBSD support... you might want to
>try that...

Take a look at
ftp://ftp.netbsd.org/pub/NetBSD/packages/pkgsrc/net/rp-pppoe/README.html
for a pkgsrc'ed version. I haven't tried it out myself, though.
Good luck,
Hans-Christian
-- 
Dr. Hans-Christian Becker (hcb@phc.chalmers.se)
Department of Physical Chemistry
Chalmers University of Technology, Sweden