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IPv4 (Part III)

Dec 2011. IPv4 (Part III). ร ศ.ดร.อนันต์ ผลเพิ่ม Asso. Prof. Anan Phonphoem, Ph.D. anan.p@ku.ac.th http://www.cpe.ku.ac.th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand. Outline. IP Fundamental Operation Internet Protocol Addressing Supporting Protocol

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IPv4 (Part III)

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  1. Dec 2011 IPv4 (Part III) รศ.ดร.อนันต์ ผลเพิ่ม Asso. Prof. Anan Phonphoem, Ph.D. anan.p@ku.ac.th http://www.cpe.ku.ac.th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand

  2. Outline • IP Fundamental Operation • Internet Protocol • Addressing • Supporting Protocol • ARP • ICMP: ping + traceroute • NAT • DHCP

  3. Network Address Translation (NAT)

  4. Network Address Translation (NAT) • Private Network • Good practice to use private address • Map local addresses to (real) public IP address(es) • Security (not expose internal details) • Alleviate IP depletion

  5. Private IP address

  6. NAT • Operates at the border of a stub network

  7. NAT

  8. Internet ADSL Router WLAN ADSL Router ADSL Modem ADSL Connection Telephone Line ADSL Modem ISP ADSL Modem

  9. Configure NAT • Static Translation • Dynamic Translation

  10. Static Translation

  11. Example

  12. Dynamic Translation

  13. PAT: Port Address Translation (Overloaded NAT)

  14. PAT 179.9.8.80

  15. Disadvantages of NAT • Delay • Loss of end-to-end ability • Might not work with some applications

  16. Bootstrap Protocol (BOOTP)

  17. BOOTP • Diskless terminal • Discover its own IP address • Download executable image file • Small program built in chip • BOOTH and TFTP • Application Protocol • Encapsulated in IP and UDP

  18. BOOTP packet format

  19. Operation

  20. Dynamic Host Configuration Protocol (DHCP)

  21. DHCP • BOOTP Enhancement • Same message structure as BOOTP • Can choose among many DHCP servers

  22. DHCP packet

  23. Operation

  24. DHCP Message

  25. DHCP transition diagram

  26. DHCP Relay

  27. DHCP Relay

  28. Summary • IP Fundamental Operation • Internet Protocol • Addressing • Supporting Protocol • ARP • ICMP: ping + traceroute • NAT • DHCP

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