Ppp

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Ppp

  1. 1. POINT-TO-POINT PROTOCOL packetlife.net PPP Components PPP SummaryLink Control Protocol (LCP) Standard RFC 1661Provides for the establishment, configuration, and maintenance of aPPP link. Protocol-independent options are negotiated by LCP. Asynchronous serial, synchronous Interfaces serial, ISDN, HSSINetwork Control Protocol (NCP)A separate NCP is used to negotiate the configuration of each PPP Featuresnetwork layer protocol (such as IP) carried by PPP. Protocol Multiplexing · Multiple NCPs PPP Header Optional Authentication · PAP/CHAP 8 16 24 32 Optional Compression · Stacker/predictor Address Control Protocol Loopback Detection · Provided by LCP LCP Header Load Balancing · Multilink PPP 8 16 24 32 Connection Phase Flowchart Code Identifier Length Auth Required Dead Establish Authentication Protocols No AuthPlaintext Authentication Protocol (PAP)Original, obsolete authentication protocol which relies on the Terminate Authenticateexchange of a plaintext key to authenticate peers (RFC 1334). Failure Admin SuccessChallenge Handshake Authentication Protocol (CHAP) ShutdownAuthenticates peers using the MD5 checksum of a pre-shared secret Networkkey (RFC 1994).Extensible Authentication Protocol (EAP) PPP Connection ExampleProvides MD5-based authentication similar to CHAP (RFC 3748).Could be expanded to support other EAP mechanisms as well. General PPP Configuration LCP Configuration Request LCP Configuration Ack! Configure a peer account if authentication will be usedusername peer-hostname password password CHAP Challenge! Configure a local IP address pool if needed CHAP Responseip pool name first-IP last-IP CHAP Successinterface Serial0/0 IP Control Configuration Request ! Enable PPP encapsulation encapsulation ppp IP Control Configuration Ack ! Enable CHAP and/or PAP for authentication CDP Control Configuration Request ppp authentication { chap | pap } [ chap | pap ] ! Enable compression CDP Control Configuration Ack compress { predictor | stac } ! Enable peer IP address assignment (server side) PPP Compression Algorithms peer default ip address { pool name | IP-address } ! Enable IP address negotiation (client side) Stacker ip address negotiated Replaces repetitive data with symbols from a dynamic dictionary (more processor-intensive) Multilink PPP Configuration Predictor Attempts to predict sequential data (more! Create the multilink interfaceinterface Multilink1 memory-intensive) ip address IP-address subnet-mask ppp multilink group group Troubleshooting show ppp multilink! Assign physical interfaces to the multilink groupinterface Serial0/0 debug ppp authentication encapsulation ppp ppp multilink group group debug ppp { negotiation | packet }by Jeremy Stretch v1.2

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