TAILIEUCHUNG - Chapter-20-Configuring PPP

Two protocols support connection to the Internet via modem: SLIP (Serial Line Internet Protocol) and PPP (Point to Point Protocol). As the name suggests, SLIP supports only IP. It is an older, less rugged protocol. Its only advantage is that it may be available where PPP isn’t. If you have the choice, always take PPP: it differs from SLIP in being able to handle multiple protocols simultaneously, and it’s also used on many DSL links (PPP over Ethernet or PPPoE). In this chapter, we’ll look only at PPP | 2 April 2003 17 00 47 The Complete FreeBSD page 339 In this chapter Quick setup How PPP works The information you need to know Setting up user PPP the fast track Setting up kernel PPP Things that can go wrong 20 Configuring PPP Two protocols support connection to the Internet via modem SLIP Serial Line Internet Protocol and PPP Point to Point Protocol . As the name suggests SLIP supports only IP. It is an older less rugged protocol. Its only advantage is that it may be available where PPP isn t. If you have the choice always take PPP it differs from SLIP in being able to handle multiple protocols simultaneously and it s also used on many DSL links PPP over Ethernet or PPPoE . In this chapter we ll look only at PPP. PPP can perform a number of functions It dials and establishes a phone connection if necessary. Strictly speaking this isn t part of the PPP specification but it is supported by most PPP implementations. It performs authentication to ensure that you are allowed to use the connection. It performs negotiation to decide what kind of protocol to use over the link. You might think that s OK I m just using IP but in fact there are a number of different ways to transmit IP datagrams over a PPP link. In addition the other end may be able to handle non-Internet protocols such as SNA and Novell s IPX. It can perform line quality monitoring to ensure that the modems are able to understand each other. FreeBSD provides two versions of PPP Traditional BSD implementations of IP are located in the kernel which makes for more efficiency. The corresponding implementation of PPP is referred to as kernel PPP. We ll look at it on page 355. v 2003 04 02 03 12 15 339 2 April 2003 17 00 47 The Complete FreeBSD . tools page 340 The Complete FreeBSD 340 Although kernel PPP is more efficient it s also frequently more difficult to debug. As a result FreeBSD also supplies an implementation known as user PPP or iijppp after the Internet Institute of .

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