Learn more about PPPoE 

"Creating PPPoE Tunnels for DSL Support"

Troubleshoot PPPoE and PPP problems 

"Diagnosing and Fixing PPPoE Problems"

Configure a PPPoE client 

"Setting Up the PPPoE Client"

Configure PAP authentication for a client 

"Configuring PAP Authentication for Trusted Callers (Dial-out Machines)"

Configure PAP authentication on a server 

"Configuring PAP Authentication on the Dial-in Server"