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Point-to-Point Protocol (PPP). ผศ. ดร. อนันต์ ผลเพิ่ม Asst.Prof.Anan Phonphoem, Ph.D. [email protected] http://www.cpe.ku.ac.th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand. Internet. ISP. Many Internet users connect from home Dial-up (Telephone line)

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Point-to-Point Protocol (PPP)

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Point to point protocol ppp

Point-to-Point Protocol (PPP)

ผศ.ดร. อนันต์ ผลเพิ่ม

Asst.Prof.Anan Phonphoem, Ph.D.

[email protected]

http://www.cpe.ku.ac.th/~anan

Computer Engineering Department

Kasetsart University, Bangkok, Thailand


Point to point protocol

Internet

ISP

  • Many Internet users connect from home

  • Dial-up (Telephone line)

  • Leased line

Point-to-Point Protocol


Ppp transition states

PPP Transition states


Ppp layers

PPP Layers


Ppp layers1

PPP Layers


Ppp layers stacks

PPP Layers (stacks)

  • Link Control Protocol (LCP)

  • Authentication Protocols

  • Network Control Protocol (NCP)

  • Bit Padding

  • Digital Signals (DS) Services


Ppp frame

PPP Frame

Address: broadcast (avoid data link address)

Control: U-frame format (HDLC)

Protocol: defines data field


Link control protocol lcp

Link Control Protocol (LCP)

  • Link Control Protocol (LCP)

    • establish/terminate

    • maintain

    • configuration

Code: 01=Config-request

02=Config-ack

05=Terminate-req


Common options

Common Options


Authentication

Authentication

  • Mostly PPP is dial-up user.

  • Validating the user is important

  • Password Authentication Protocol (PAP)

    • 2-way handshake

    • Less secure

  • Challenge Handshake Authentication Protocol (CHAP)

    • 3-way handshake

    • More secure (no password sent)


Password authentication protocol pap

Password Authentication Protocol (PAP)


Pap packets

PAP Packets


Challenge handshake authentication protocol chap

Challenge Handshake Authentication Protocol (CHAP)


Chap packets

CHAP packets


Ppp transition states1

PPP Transition states


Internetwork protocol control protocol ipcp

Internetwork Protocol Control Protocol (IPCP)

  • Establish / Terminate @ network layer connection (IP)

  • Code 01:Configure-request

  • 02:Configure-ack


Ppp communication

PPP communication


Ppp configuration

PPP configuration


Ppp configuration1

PPP configuration


Point to point protocol ppp

Lab

  • 3.3.2 PPP encapsulation

  • 3.3.3 PPP authentication

  • 3.3.5 Troubleshooting PPP


  • Login