Just curious, it did install ppp right? I haven't used Mandrake in a while so I can't remember how to check to see if it is. I did run into that once with Gentoo though. I left it out of the kernel.
Hope that helps, otherwise, BUMP.
Oh, Kppp does the dialing. PPP maintains the connection to the server on the other end. You might say Kppp is what you see, ppp is the part that is in the background.