Point-to-Point Access:

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Presentation transcript:

Point-to-Point Access: Chapter 12 Point-to-Point Access: PPP

12.1 Point-To-Point Protocol Frame Format Transition States

12.1 PPP frame

12.2 Transition states

12.2 PPP Stack Link Control Protocol (LCP) Authentication Protocols Network Control Protocol (NCP) Bit Padding Digital Signals (DS) Services

12.3 Protocol stack

12.4 LCP packet encapsulated in a frame

Table 12.1 LCP packets and their codes Packet Type Description 0116 Configure-request Contains the list of proposed options and their values 0216 Configure-ack Accepts all options proposed 0316 Configure-nak Announces that some options are not acceptable 0416 Configure-reject Announces that some options are not recognized 0516 Terminate-request Requests to shut down the line 0616 Terminate-ack Accepts the shut down request 0716 Code-reject Announces an unknown code 0816 Protocol-reject Announces an unknown protocol 0916 Echo-request A type of hello message to check if the other end is alive 0A16 Echo-reply The response to the echo-request message 0B16 Discard-request A request to discard the packet

Table 12.2 Common options Maximum receive unit 1500 Default Maximum receive unit 1500 Authentication protocol None Protocol field compression Off Address and control field compression

12.5 PAP

12.6 PAP packets

12.7 CHAP

12.8 CHAP packets

12.9 IPCP packet encapsulated in PPP frame

Table 12.3 Code value for IPCP packets 01 Configure-request 02 Configure-ack 03 Configure-nak 04 Configure-reject 05 Terminate-request 06 Terminate-ack 07 Code-reject

12.10 An example