First of all you're going to have better luck if you connect the modem to the nic rather USB. Second, posts on my Lug's list indicate that Suse's version of pppoe is broken in some fashion so that you would be better off to grab Roaring Penguin's version. It will fit on a floppy so you can use your Windows connection to retrieve it.
Once you get it installed on your machine, su to root and type adsl-setup, hit enter and follow the prompts. Because your ISP uses dhcp, when the program asks, enter server.The next sticky bit is when it asks about initiating the connection at boot. The question is confusing because of the way its constructed (it contains a double negative) -- so the correct answer is actually no. At the end of the program it will ask you about a firewall. You will be better off to choose no firewall here and then configure the one that comes with Suse. The firewall that comes with rp-pppoe doesn't offer much protection. Finally to connect the first time type adsl-start. The next time you boot your machine the service will start automatically. If for any reason, you have to take your firewall off-line you can kill the connection by entering adsl-stop as root.
Canadian0812