DSL Authentication Using ipcop Router

I've decided to setup a Linux router using ipcop. www.ipcop.org I have a DSL connection using pppoe that requires a user name and password for authentication. After installing the distro, I realized that there doesn't seem to be anyplace to enter or store the user name and password. I am currently using a Linksys and could put ipcop on the DMZ, using the Linksys for authentication. That seems a little redundant to me.

Does anyone have any experience with ipcop and DSL/pppoe? Is there an add on for this feature?

I could just stick with the linksys, but where's the fun in that? Besides, ipcop has a bunch of extra goodies.

Any input is greatly appreciated.