im using a 3com 812 remote adsl modem, 3.3 of knoppix, and the router has all the numbers it needs to connect ( ip , dns , username, password, etc. ) in it, so its connected to the internet and the problem is: how to make the netcard to connect with the router with knoppix?

its static ip, so i dont need dhcp because my ip its always the same... it gives a error anyways when tryinig the adsl/ppp thingy..
so i tried to manually configure it, but i dont know what to put on the netcard config, tried with the values there were and internet wont work.. plz help

it was running whiout problems on winxp
pd: im a linux noob

edit: i think my problem is in the broadcasting adress field.. how to know it? ( i have a winxp comp on the same network, but ipconfig wont give it
thanks