Point-to-Point Protocol daemon: Difference between revisions

Revision as of 01:35, 8 January 2011

Revision as of 18:04, 15 December 2011

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During session establishment, pppd has the role of:

* Looped link detection: PPP detects looped links using [[Magic number (programming)|magic numbers]]. When PPPD sends PPP LCP messages, these messages include a magic number. If a line is looped, the node receives an LCP message with its own magic number, instead of getting a message with the peer's magic number.

*Automatic self configuration: Using [[Link Control Protocol]] it has to negotiate protocol features like Address-and-Control-Field-Compression (ACFC), escaped characters, and the compression, encryption (like [[MPPE]]) and authentication methods to use.

*Access control and authentication: Using protocols like [[Challenge-handshake authentication protocol]] (CHAP) or [[Password authentication protocol]] (PAP) it has to provide and check authentication data.

*Layer 3 configuration: If using [[Internet Protocol Control Protocol]] (IPCP), it will negotiate or determine [[Internet Protocol|IP]] parameters such as the [[IP address]]es, the [[maximum transmission unit]], and [[name server]] addresses. Some versions may also support [[Internetwork Packet Exchange Control Protocol]] (IPXCP) and [[AppleTalk Control Protocol]] (ATCP) for routing [[IPX]] or [[Appletalk]] over the link.

*After negotiation is complete, it has to setupset up the required network interfaces and routes, so that the connection is run by the [[Kernel (computer science)|kernel]].

pppd terminates a PPP link when: