For more information about widely used PPP implementations, including ANU PPP, refer to the following books:
Carlson, James. PPP Design, Implementation, and Debugging. 2nd ed. Addison-Wesley, 2000.
Sun, Andrew. Using and Managing PPP. O'Reilly & Associates, 1999.
1661 and 1662, which describe the major features of PPP
1334, which describes authentication protocols, such as Password Authentication Protocol (PAP) and Challenge-Handshake Authentication Protocol (CHAP)
1332, an informational RFC that describes PPP over Ethernet (PPPoE)
To obtain copies of PPP RFCs, specify the number of the RFC on the IETF RFC web page at http://www.ietf.org/rfc.html.
For technical details about the Solaris PPP 4.0 implementation, refer to the following man pages:
Also, see the man page for pppdump(1M). You can find the PPP-related man pages by using the man command.