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Mobile IP By Keenan Yang May 29, 2003

MultiMedia Systems CSE 228 Mobile IP By Keenan Yang May 29, 2003 What is Mobile IP? Mobile IP stands for Mobile Internet Protocol A wireless connection to the Internet Designed to support host mobility Stay connected regardless of location without changing IP address Definitions

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Mobile IP By Keenan Yang May 29, 2003

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  1. MultiMedia Systems CSE 228 Mobile IP By Keenan Yang May 29, 2003

  2. What is Mobile IP? • Mobile IP stands for Mobile Internet Protocol • A wireless connection to the Internet • Designed to support host mobility • Stay connected regardless of location without changing IP address

  3. Definitions • Mobile Node A node/device that changes its point of attachment to the Internet • Home Agent A router in the home network that communicates with the mobile node • Foreign Agent A router in a foreign network that delivers information between mobile node and its home agent • Care-of-Address Mobile Node’s current IP address • Correspondent Node Node/device that is communicating with the mobile node (i.e. web server)

  4. How does Mobile IP work? • Each mobile node has two IP addresses • - Permanent home address • - Care-of Address • Home Agent maintains a mobility binding table

  5. How does Mobile IP work? (Cont’d) • Foreign Agent contains a visitor list

  6. How does Mobile IP work? (Cont’d) What will happen when a packet is sent to the mobile node that is not attached to its home network? • Home agent forwards the packet to the care-of address of the mobile node using the binding table • Encapsulation - Home agent constructs new IP header with care-of address - Original IP address in payload

  7. How does Mobile IP work? (Cont’d) • Foreign agent restores the original IP address from the payload • Foreign agent consults the visitor list for mobile node • Packet is then forward to the mobile node through the media address

  8. How does Mobile IP work? (Cont’d) What will happen when mobile node tries to send a packet? • Packets are sent to the foreign agent • Foreign agent sends the packets using normal IP routing

  9. Agent Discovery How does the mobility binding table and the visitor list get updated? • Agent periodically broadcast its present by sending Agent advertisement message • Mobile node sends Agent Solicitation message

  10. Registration What will happen when the mobile node wants to register with the foreign agent? • Mobile node sends a registration request message to the foreign agent • Foreign agent then sends a registration request message to the home agent • Home agent updates the mobility binding table and send an acknowledgement back to the foreign agent • Foreign agent then updates the visitor list and send an acknowledgement back to the mobile node

  11. Registration (Cont’d)

  12. Summary • Mobile IP has no geographical limitation • No need to change current IP address format or router implementation • Mobile IP enables mobile connection to network • The future is wireless!

  13. References • Charles Perkins. Mobile Networking Through Mobile IP. http://www.computer.org/internet/v2n1/perkins.htm • Chen Yi-an. A Survey Paper on Mobile IP. http://www.cis.ohio-state.edu/~jain/cis788-95/mobile_ip • Debalina Ghosh. Mobile IP: Connecting the World. http://www.acm.org/crossroads/xrds7-2/mobileip.html

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