6610-l12- - Mobile IP 1 Puzzle Teacher comes to class on...

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1 Mobile IP
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Puzzle Teacher comes to class on Friday and tells students: “I will give you a surprise exam next week” Class meets on M-F every day 9-10am Can the teacher accomplish giving a truly surprise exam?
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3 Internet hosts & Mobility Wireless networking – allows Internet users to become mobile As users move, they have to be handed over from one coverage area to another (since the coverage areas of access points are finite) … Ongoing connections need to be maintained as the user moves …
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4 Problems? What are the problems? The IP address associated with a mobile host is network dependent! When user connects to another network, IP address needs to change Packets belonging to ongoing connections somehow need to be delivered to the mobile host
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5 Problems (Contd.)? What are the options? Make IP address host specific instead of network specific – obvious pitfalls? Change IP address of host and start using the new IP address in the subsequent packets belonging to the connections
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6 Intuitive Solution Take up the analogy of you moving from one apartment to another What do you do? Leave a forwarding address with your old post-office! The old post-office forwards mails to your new post-office, which then forwards them to you
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7 Mobile IP Basics Same as the post-office analogy Two other entities – home agent (old post-office), foreign agent (new post-office) Mobile host registers with home agent the new location Home agent captures packets meant for mobile host, and forwards it to the foreign agent, which then delivers it to the mobile host
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8 Reverse path? Same as in the post-office analogy Packets originating from the mobile host go directly to the static corresponding host … HA SH MH FA MH  Hence the name triangular routing
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9 Mobile IP Entities Mobile host Corresponding host Home address Care-of address Home agent Foreign agent
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10 Mobile IP in detail … Combination of 3 separable mechanisms: Discovering the care-of address Registering the care-of address Tunneling to the care-of address
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11 Discovering the care-of address Discovery process built on top of an existing standard protocol: router advertisement (RFC 1256) Router advertisements extended to carry available care-of addresses called: agent advertisements Foreign agents (and home agents) send agent advertisements periodically A mobile host can choose not to wait for an advertisement, and issue a solicitation message
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12 Agent advertisements Foreign agents send advertisements to advertise available care-of addresses Home agents send advertisements to make themselves known
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6610-l12- - Mobile IP 1 Puzzle Teacher comes to class on...

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