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Chap 24 mobile ip

TCP-IP BY FOROUZAN

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Chap 24 mobile ip

  1. 1. CChhaapptteerr 2244 MMoobbiillee IIPP Objectives Upon completion you will be able to: • Understand the addressing scheme for mobile hosts. • To define home, care-of, and co-located care-of addresses • Understand the interactions between a home and a foreign agent • Know the three phases involved in mobile communication • Understand why mobile IP communication can be inefficient TCP/IP Protocol Suite 1
  2. 2. 24.1 ADDRESSING The main problem that must be solved iinn pprroovviiddiinngg mmoobbiillee ccoommmmuunniiccaattiioonn uussiinngg tthhee IIPP pprroottooccooll iiss aaddddrreessssiinngg.. TThhee ttooppiiccss ddiissccuusssseedd iinn tthhiiss sseeccttiioonn iinncclluuddee:: SSttaattiioonnaarryy HHoossttss MMoobbiillee HHoossttss TCP/IP Protocol Suite 2
  3. 3. NNoottee:: The IP addresses are designed to work with stationary hosts because part of the address defines the network to which the host is attached. TCP/IP Protocol Suite 3
  4. 4. Figure 24.1 Home address and care-of address TCP/IP Protocol Suite 4
  5. 5. NNoottee:: Mobile IP has two addresses for a mobile host: one home address and one care-of address. The home address is permanent; the care-of address changes as the mobile host moves from one network to another. TCP/IP Protocol Suite 5
  6. 6. 24.2 AGENTS To make the change of address transparent to the rreesstt ooff tthhee IInntteerrnneett rreeqquuiirreess aa hhoommee aaggeenntt aanndd aa ffoorreeiiggnn aaggeenntt.. TThhee ssppeecciiffiicc ffuunnccttiioonn ooff aann aaggeenntt iiss ppeerrffoorrmmeedd iinn tthhee aapppplliiccaattiioonn llaayyeerr.. TThhee ttooppiiccss ddiissccuusssseedd iinn tthhiiss sseeccttiioonn iinncclluuddee:: HHoommee AAggeenntt FFoorreeiiggnn AAggeenntt TCP/IP Protocol Suite 6
  7. 7. Figure 24.2 Home agent and foreign agent TCP/IP Protocol Suite 7
  8. 8. NNoottee:: When the mobile host and the foreign agent are the same, the care-of address is called a co-located care-of address. TCP/IP Protocol Suite 8
  9. 9. 24.3 THREE PHASES To communicate with a remote host, a mobile hhoosstt ggooeess tthhrroouugghh tthhrreeee pphhaasseess:: aaggeenntt ddiissccoovveerryy,, rreeggiissttrraattiioonn,, aanndd ddaattaa ttrraannssffeerr.. TThhee ttooppiiccss ddiissccuusssseedd iinn tthhiiss sseeccttiioonn iinncclluuddee:: AAggeenntt DDiissccoovveerryy RReeggiissttrraattiioonn DDaattaa TTrraannssffeerr TCP/IP Protocol Suite 9
  10. 10. Figure 24.3 Remote host and mobile host communication TCP/IP Protocol Suite 10
  11. 11. NNoottee:: Mobile IP does not use a new packet type for agent advertisement; it uses the router advertisement packet of ICMP, and appends an agent advertisement message. TCP/IP Protocol Suite 11
  12. 12. Figure 24.4 Agent advertisement TCP/IP Protocol Suite 12
  13. 13. TTaabbllee 2244..11 CCooddee bbiittss TCP/IP Protocol Suite 13
  14. 14. NNoottee:: Mobile IP does not use a new packet type for agent solicitation; it uses the router solicitation packet of ICMP. TCP/IP Protocol Suite 14
  15. 15. Figure 24.5 Registration request and reply TCP/IP Protocol Suite 15
  16. 16. Figure 24.6 Registration request format TCP/IP Protocol Suite 16
  17. 17. TTaabbllee 2244..22 RReeggiissttrraattiioonn rreeqquueesstt ffllaagg ffiieelldd bbiittss TCP/IP Protocol Suite 17
  18. 18. Figure 24.7 Registration reply format TCP/IP Protocol Suite 18
  19. 19. NNoottee:: A registration request or reply is sent by UDP using the well-known port 434. TCP/IP Protocol Suite 19
  20. 20. Figure 24.8 Data transfer TCP/IP Protocol Suite 20
  21. 21. NNoottee:: The movement of the mobile host is transparent to the rest of the Internet. TCP/IP Protocol Suite 21
  22. 22. 24.4 INEFFICIENCY IN MOBILE IP Communication involving mobile IP can be inefficient. AA sseevveerree ccaassee iiss ccaalllleedd ddoouubbllee ccrroossssiinngg oorr 22XX.. AA mmooddeerraattee ccaassee iiss ccaalllleedd ttrriiaannggllee rroouuttiinngg oorr ddoogg--lleegg rroouuttiinngg.. TThhee ttooppiiccss ddiissccuusssseedd iinn tthhiiss sseeccttiioonn iinncclluuddee:: DDoouubbllee CCrroossssiinngg TTrriiaannggllee RRoouuttiinngg SSoolluuttiioonn TCP/IP Protocol Suite 22
  23. 23. Figure 24.9 Double crossing TCP/IP Protocol Suite 23
  24. 24. Figure 24.10 Triangle routing TCP/IP Protocol Suite 24

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TCP-IP BY FOROUZAN

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