A lot of DSL modems actually have routing functionality that interferes with your actual router. They tend to use a PPOE setup, which means you have to tell your modem to not do PPOE and use the settings that it had to tell your router it's a PPOE connection, complete with the login user/pass and external IP address the modem was getting. I know that sounds complex, so maybe just google on that subject with some keywords and you'll likely find the steps for it.
If it says it's easy, I probably need the php four moves of doom (localhost, dbname, dbpass, tablename) and that's it. I do like that it can use MS Access, but I'll feel a lot more comfortable if there's MySQL. Thanks for the input.