Now, the industry's #1 hands-on PPP developer's guide has been updated to reflect the latest PPP advances, including SONET/SDH, optical PPP links, the use of PPP in telecommunications, and Linux-based PPP implementation -- a topic of exceptionally hot interest. In this book, leading network software architect James Carlson explains how PPP links operate, in depth, so developers can build more effective PPP implementations, and troubleshoot failures more effectively. Readers will learn how to implement and extend PPP in many environments, including Linux and UNIX. Carlson introduces PPP's growing role in telecommunications, including optical PPP links, PPP's relationship with SONET/SDH, and more. He also explains PPP's relationships to OSPF and other protocols, including PPP/L2TP integration in virtual private networks.