Installing and Administering PPP

Chapter 1 19
Introduction
Product Overview
• Minimizes transmission overhead. PPP compresses HDLC address
control and protocol fields, as well as TCP headers. This improves
both throughput and interactive response on typical modem
connections. The PPP interface to HP-UX TCP/IP implements Van
Jacobson’s TCP “fast queue” scheme, whereby interactive packets
have priority to transmission on a congested link.
PPP does not support traffic encryption.
pppd is the daemon process provided with PPP to manage connections to
other hosts via the point-to-point or SLIP protocols. It uses the HP-UX
native serial ports. The daemon communicates with the HP-UX Kernel’s
TCP/IP stack via an IP network tunnel driver.