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Point-to-Point Protocol (PPP)

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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  1. 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

  2. Internet ISP • Many Internet users connect from home • Dial-up (Telephone line) • Leased line Point-to-Point Protocol

  3. PPP Transition states

  4. PPP Layers

  5. PPP Layers

  6. PPP Layers (stacks) • Link Control Protocol (LCP) • Authentication Protocols • Network Control Protocol (NCP) • Bit Padding • Digital Signals (DS) Services

  7. PPP Frame Address: broadcast (avoid data link address) Control: U-frame format (HDLC) Protocol: defines data field

  8. Link Control Protocol (LCP) • Link Control Protocol (LCP) • establish/terminate • maintain • configuration Code: 01=Config-request 02=Config-ack 05=Terminate-req …

  9. Common Options

  10. 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)

  11. Password Authentication Protocol (PAP)

  12. PAP Packets

  13. Challenge Handshake Authentication Protocol (CHAP)

  14. CHAP packets

  15. PPP Transition states

  16. Internetwork Protocol Control Protocol (IPCP) • Establish / Terminate @ network layer connection (IP) • Code 01:Configure-request • 02:Configure-ack • …

  17. PPP communication

  18. PPP configuration

  19. PPP configuration

  20. Lab • 3.3.2 PPP encapsulation • 3.3.3 PPP authentication • 3.3.5 Troubleshooting PPP

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