Mobile ip


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Mobile ip

  1. 1. Nitheesh K VIAHECS030 Department of computer science CS 640 1
  2. 2. Mobile IP Mobile IP was designed to allow mobile device users to move from one network to another .  Enables hosts to stay connected to the Internet regardless of their location.  Enables hosts to be tracked without needing to change their IP address.  Requires no changes to software of non-mobile hosts/routers.  Has no geographical limitations.  Supports security. Standardized by IETF . CS 640 2
  3. 3. Mobile IP Entities Mobile Node (MN)  The entity that may change its point of attachment from network to network in the Internet.  Two addresses:- 1. Home address – IP address assigned to the device within its home network . 2. Care-of address (COA)– IP address of the device when it is operating in a foreign network.  Identifies Mobile Node’s current location.  Sent by Foreign Agent to Home Agent when MN attaches.  Usually the IP address of the Foreign Agent. CS 640 3
  4. 4. Mobile IP Entities Home Network – The network within which the device receives its Home address Home Agent (HA)  Stores information about Mobile nodes whose permanent Home address is in Home Agent’s Network.  Located on home network of Mobile Node.  Does mobility binding of MN’s IP with its COA  Forwards packets to network when MN is away  Does this through encapsulation CS 640 4
  5. 5. Mobile IP Entities contd. Foreign network – Network in which the Mobile Node is away from its Home network. Foreign Agent (FA)  Stores information about mobile nodes visiting its network.  If MN is away from HA then it uses a FA to send/receive data to/from HA  Advertises Care-of addresses which are used by Mobile IP.  Decapsulates messages for delivery to MN Binding – Association of Home address with Care-of address. Correspondent Node(CN) – End host of MN. CS 640 5
  6. 6. Mobile IP Operation Agent Discovery  HA’s and FA’s broadcast their presence on each network to which they are attached  MN’s listen for advertisement and then initiate registration Encapsulation – Attaching COA to the packet with HA Decapsulation –Detaching COA to the packet with HA Registration  When MN is away, it registers its COA with its HA  Registration happens as often as MN changes networks  There is a specific lifetime for service for registration  There is also a de-registration process if an MN returns home CS 640 6
  7. 7. Mobile IP Operation A MN listens for agent advertisement and then initiates registration After receiving the registration request from a MN, FA request to HA The HA acknowledges and registration is complete HA intercepts all packets destined for MN HA then encapsulates all packets addressed to MN and forwards them to FA FA decapsulates all packets addressed to MN and forwards them via hardware address CS 640 7
  8. 8. Registration Process CS 640 8
  9. 9. Tables maintained on routers Mobility Binding Table  Maintained on HA of MN  Maps MN’s home address with its current COA Visitor List  Maintained on FA  Maps MN’s home address HA address CS 640 9
  10. 10. Mobile IP Tunneling CS 640 10 Across Internet
  11. 11. Mobile IP Problems Single HA model may be damaged Possible solution – have multiple HA Frequent reports to HA if MN is moving Applications Found in Wired and Wireless environments. Able to carry mobile devices across Multiple LANS. CS 640 11
  12. 12. THANK YOU CS 640 12