Many ISPs and corporate PPP servers use PAP. If your server does
not require you to use PAP (if you can log in manually and receive
the standard user name/password text based prompts it does not use PAP),
you can safely ignore this section.
Instead of logging into such a server using a user name and password
when prompted to enter them by the server, a PPP server using PAP does
not require a text based login.
The user authentication information instead is exchanged as part of the
link control protocol (LCP), which is the first part of establishing a
PPP link.
Section Chapter 16 provides information on the files you need to set up to
establish a PPP link using PAP.
Take our 
