Chapter 9

Configuring the Point-to-Point Protocol (PPP)

Commonly, PPP is used to connect computers in homes and small offices to workplace computers (to enable file transfer, remote login, and other TCP/IP capabilities) or to Internet service providers (to access services such as World Wide Web servers and Usenet news).

SCO PPP is an implementation of the Point-to-Point Protocol (PPP) as defined in the following Internet standards: RFC 1144, RFC 1172, RFC 1332, RFC 1334, RFC 1471, RFC 1473, and RFC 1548.

Use PPP when an Ethernet or Token-Ring connection between the local host and another location is not possible but a serial line connection is. PPP can be used to connect the local host to another host via a single, physical serial line connection between serial ports or over longer distances using telephone lines and modems. A computer that is running PPP over one or more serial lines and that is also connected to a computer network (such as an Ethernet) can serve as a communication gateway between computers on the network and the computers at the far ends of the serial lines.

This chapter describes:

• PPP concepts

• Configuring PPP

• Administering PPP

• Troubleshooting PPP

• Other sources of PPP information

Also available for serial line communication, for use instead of PPP, is SLIP. See Chapter 10, ``Configuring the Serial Line Internet Protocol (SLIP)'', for more information on SLIP, and ``Serial line communications'', for a comparison of the two protocols.

SCO PPP supports only asynchronous communications. SCO provides PPP as a discrete package within the SCO TCP/IP runtime system, meaning it may be selectively installed with SCO TCP/IP.

Terminology used in this chapter:

endpoint

the definition of one end of a PPP link -- a PPP interface and its link are constructed from this definition

line

as in serial line -- the physical medium over which data flows

link

as in PPP link -- the virtual connection between two machines over which data flows

interface

as in PPP interface -- the abstract entity to which the IP driver routes datagrams

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