if the ip-adress 192.168.0.1 doesn't work try: 192.168.1.1 (thats default for mine)
another way is download the pppoe-tools from roaring penguin,
as root start "adsl-config" to setup your ethernet devices, for connections to start
type "adsl-start"
there is also a pppoe package that should come with your slackware-cds, but the taking it
from:
http://www.roaringpenguin.com/pengui...e_rp-pppoe.php should be more up to date