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Mobile IP Part I: IPv4OverviewMobile IP: FeaturesMobile IP: TerminologyTerminologyTerminology (Cont)Slide 8Slide 9Slide 10Mobile IP: ProcessesProcesses (Cont)Encapsulation/TunnelingReverse TunnelingHome Networks with Dynamic IP AddressDynamic Home Agent AssignmentNetwork Mobility (NEMO)Security IssuesMobile IP and VPNMobile IP and VPN (Cont)Slide 21SummaryReading AssignmentMobile IPv4: RFCsMobile IPv4: RFCs (Cont)Slide 26Homework12-1©2006 Raj JainCSE574sWashington University in St. LouisMobile IPMobile IPPart I: IPv4Part I: IPv4Raj Jain Washington University in Saint LouisSaint Louis, MO [email protected] slides are available on-line at:http://www.cse.wustl.edu/~jain/cse574-06/12-2©2006 Raj JainCSE574sWashington University in St. LouisOverviewOverviewMobile IP: TerminologyProcesses: Registration, Advertisements, ..Security IssuesReverse TunnelingHome Networks with Dynamic IP AddressDynamic Home Agent AssignmentNetwork Mobility (NEMO)Mobile IP and VPN12-3©2006 Raj JainCSE574sWashington University in St. LouisMobile IP: FeaturesMobile IP: FeaturesYou can take you notebook to any locationYour TCP connection can continue. TCP connections are from one IP address to another IP address TCP is unaware of the mobilityContinuous access to your home resourcesAccess to local resources: PrintersFinds nearby IP routers and connects automatically Your IP messages are delivered to your new locationOnly "Mobility Aware" routers and mobile units need new s/wOther routers and hosts can use current IPNo new IP address formats.Secure: Allows authentication12-5©2006 Raj JainCSE574sWashington University in St. LouisMobile IP: TerminologyMobile IP: TerminologyMobile Node (MN)Home Agent (HA), Foreign Agent (FA)Care-of-address (COA): Address of the end-of-tunnel towards the mobile nodeCorrespondent Node (CN)Home Address: Mobile’s permanent IP addressHomeAgentMobileNodeCorrespondentNodeForeignAgentHome netNodemovesNew netMobileNode12-6©2006 Raj JainCSE574sWashington University in St. LouisTerminologyTerminologyHome Address: Long-term IP address of the mobile on the home networkIP Access Address: Local IP address of the mobile on the foreign networkCare-of-Address: Address to which the packets are sent by the home agent. Destination of the IP tunnel between home agent and the mobile. Generally COA=IP Access AddressMobility Agent: Home agent or foreign agentAgent Advertisement: Periodic advertisement from mobility agentsCorrespondent Node: The node communicating with mobileForeign Network: Any network other than the home networkGratuitous ARP: Sent by home agent to update other node’s ARP cache12-7©2006 Raj JainCSE574sWashington University in St. LouisTerminology (Cont)Terminology (Cont)Mobility Binding: Binding between home address and COA Tunnel: Path followed by an encapsulated packetMobile Router: A router with changing point of attachmentMobile Host: A end host (not a router) Mobile Node: Mobile Host or Mobile RouterMobile Network: An entire network that changes its point of attachmentMobile Network Node: A node in a mobile network. May itself be mobile (visiting) or fixed (permanent) member of the network.Roaming: Getting connectivity from a foreign network based on a formal agreement between foreign and home network service providers12-8©2006 Raj JainCSE574sWashington University in St. LouisTerminology (Cont)Terminology (Cont)Handover: Changing the point of attachmentL2 Handover: Moving from one access point to another access point in the same IP network (same network prefix)L3 Handover: Moving from one IP network to another.Moving from one access router to another access routerHorizontal Handover: Moving between same technology. WLAN to WLAN or 3G to 3GVertical Handover: Moving between different technologies. WLAN to 3G.Push Handover: Previous access router initiates handoverPull Handover: New access router initiates handover12-9©2006 Raj JainCSE574sWashington University in St. LouisTerminology (Cont)Terminology (Cont)Make-Before-Break: Make a new connection before disconnecting previous. Will communicate with both for some time.Break-before-Make: Disconnect previous and then connect with next.Handover Delay: Time between break and make.Smooth Handover: Minimize packet loss. Handover delay not critical.Fast Handover: Minimize handover delay. Packet loss not critical.Seamless Handover: No change in quality, security, or capability of service.12-10©2006 Raj JainCSE574sWashington University in St. LouisTerminology (Cont)Terminology (Cont)Diversity: Ability to receive two signals at the same time.Micro Diversity: Two signals between the same subscriber and base stationMacro Diversity: Two signals from different base stationsIP Diversity: Packets from two IP networksMicro Mobility: Mobility within a single network. No effect outside the network. a.k.a. Local Mobility.Macro Mobility: Mobility between networks. Requires Mobile IP type solution. a.k.a. Global Mobility.12-11©2006 Raj JainCSE574sWashington University in St. LouisMobile IP: ProcessesMobile IP: ProcessesAgent Discovery: To find agentsHome agents and foreign agents advertise periodically on network layer and optionally on datalink They also respond to solicitation from mobile node Mobile can send solicitation to Mobile agent multicast group 224.0.0.11Mobile selects an agent and gets/uses care-of-addressRegistrationMobile registers its care-of-address with home agent.Either directly or through foreign agentHome agent sends a reply to the CoAEach "Mobility binding" has a negotiated lifetime limitTo continue, reregister within lifetime12-12©2006 Raj JainCSE574sWashington University in St. LouisProcesses (Cont)Processes (Cont)Return to Home:Mobile node deregisters with home agent sets care-of-address to its permanent IP addressLifetime = 0  DeregistrationDeregistration with foreign agents is not required. Expires automaticallySimultaneous registrations with more than one COA allowed (for handoff)12-13©2006 Raj JainCSE574sWashington University in St. LouisEncapsulation/TunnelingEncapsulation/TunnelingHome agent intercepts mobile node's datagrams and forwards them to care-of-addressCare of Address can be the Foreign Agent or it can be co-located in the mobile hostHome agent tells local nodes


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WUSTL CSE 574S - Mobile IP Part I: IPv4

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