Leased Lines Links; Point-To-Point Protocol (Ppp) - Intel ER8100STUS - Express 8100 Router Reference Manual

Leased Lines Links

In this chapter

Point-to-Point Protocol (PPP)

Introduction to PPP
The WAN connect protocol used for communicating over leased line WAN con-
nections by the Intel Express 8100 Router is the Point-to-Point Protocol (PPP).
When communicating over leased line connections, PPP runs on top of the High-
level Data Link Control (HDLC) protocol.
PPP is also used for communications over ISDN links (PPP over
Note
ISDN).
This chapter gives an introduction to the Point-to-Point Protocol (PPP) and de-
scribes the features of the protocol offered by the Intel Express 8100 Router.
The Point-to-Point Protocol (PPP) was designed to enable simultaneous transfer
of network-layer protocols across a point-to-point link. Its main function is to es-
tablish a synchronous link connection between routers from any manufacturer.
PPP functions include:
encapsulating multi-protocol datagrams
establishing, configuring and testing the data-link connection using a Link
Control Protocol (LCP)
establishing and configuring bridging and various network-layer communi-
cations across the link using Network Control Protocols (NCPs). This is han-
dled by the Internet Protocol Control Protocol (IPCP) for IP, and the
Internetwork Packet Exchange Control Protocol (IPXCP) for IPX and the
Bridging Control Protocol (BCP) for bridging services
authenticating peers using the Challenge Handshake Authentication Protocol
(CHAP) and Password Authentication Protocol (PAP) to ensure that commu-
nications are between authorized devices
encrypting and decrypting data transmitted via the link to offer data security
compression/decompression of data to improve the throughput of data
Chapter 2
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