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Point-to-Point Protocol (PPP) PowerPoint PPT Presentation


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Point-to-Point Protocol (PPP). ผศ. ดร. อนันต์ ผลเพิ่ม Asst.Prof.Anan Phonphoem, Ph.D. anan@cpe.ku.ac.th 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)

ผศ.ดร. อนันต์ ผลเพิ่ม

Asst.Prof.Anan Phonphoem, Ph.D.

anan@cpe.ku.ac.th

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)

  • Leased line

Point-to-Point Protocol


PPP Transition states


PPP Layers


PPP Layers


PPP Layers (stacks)

  • Link Control Protocol (LCP)

  • Authentication Protocols

  • Network Control Protocol (NCP)

  • Bit Padding

  • Digital Signals (DS) Services


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)

    • establish/terminate

    • maintain

    • configuration

Code: 01=Config-request

02=Config-ack

05=Terminate-req


Common Options


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)


PAP Packets


Challenge Handshake Authentication Protocol (CHAP)


CHAP packets


PPP Transition states


Internetwork Protocol Control Protocol (IPCP)

  • Establish / Terminate @ network layer connection (IP)

  • Code 01:Configure-request

  • 02:Configure-ack


PPP communication


PPP configuration


PPP configuration


Lab

  • 3.3.2 PPP encapsulation

  • 3.3.3 PPP authentication

  • 3.3.5 Troubleshooting PPP


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