Lecture TCP-IP protocol suite - Chapter 27: Mobile IP

Mobile communication has received a lot of attention in the last decade. The interest in mobile communication on the Internet means that the IP protocol, originally designed for stationary devices, must be enhanced to allow the use of mobile computers, computers that move from one network to another.
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Lecture TCP-IP protocol suite - Chapter 27: Mobile IP Chapter27 Mobile IPMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 CONTENTS •ADDRESSING •AGENTS •THREEPHASES •AGENTDISCOVERY •REGISTRATION •DATATRANSFER •INEFFICIENCYINMOBILEIPMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 27.1 ADDRESSINGMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 The IP addresses are designed to work with stationary hosts because part of the address defines the network to which the host is attached.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure271 HostaddressandcareofaddressMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 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.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 27.2 AGENTSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure272 HomeagentandforeignagentMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 When the mobile host and the foreign agent are the same, the care-of address is called a co-located care-of address.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 27.3 THREE PHASESMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure273 RemotehostandmobilehostcommunicationMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 27.4 AGENT DISCOVERYMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure274 AgentadvertisementMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 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.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 Mobile IP does not use a new packet type for agent solicitation; it uses the router solicitation packet of ICMP.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 27.5 REGISTRATIONMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure275 RegistrationrequestandreplyMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure276 RegistrationrequestformatMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure277 RegistrationreplyformatMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 A registration request or reply is sent by UDP using the well-known port 434.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000