Ethernet modem to extreme base station trouble

Hi
I am having trouble connecing my ethernet modem (DSL 300t) to my airport extreme base station.
The modem works fine plugged directly into my computer.
The base station seems to be working fine when it is not connected to the modem.
It was suggested that the problem was due to a DHCP conflict... I have tried a number of things including turning the modem to 'bridge' mode only (no success) and turning the option on the base station to issue IP addresses off (limited success - worked for a while then connection dropped out, also I got a few messages saying "The IP address 82.25.182.107 is already in use by device 192.168.1.1" which is the address used to set up ethernet modem using browser).
Since I have very little idea what most of the paragraph above really means would someone be able to give me a simple step-by-step solution?
Any help would be very much appreciated!
Intel Duo   Mac OS X (10.4.4)  

Hi Donald,
Thanks for the welcome and the advise. Unfortunately it did not do the trick.
When I restarted the 'internet connect' window said I was connected but I couldn't open any webpages or connect anything to the internet.
However as I said above, when I disabled the base station from distributing IP addresses I got intermittant access - I am wondering if this will help point to a solution?
Otherwise; it is possible to use the modem only as a bridge, but when I tried this the only way to put in ISP account information seemed to be using the PPoE option in 'network'. Then all I get is a message saying "searching for PP host" (or similar) which it never finds... is there a method to set it up this way that will work?
Any further advise would be much appreciated as there is not very much detail that I can find in the airport manual about this.
Cheers!

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