nat and vpn using w2k3 PPPOE

how do i setup nat and vpn using PPPOE builtin to the w2k3?
when i ran the nat and vpn wizard and come to the part where it says choose the protocol that connects this computer to the internet i only see the NIC cards and not the PPPOE protocol, any ideas? or how do i setup nat and vpn and still use the PPPOE to connect to the internet?