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Wireless Mobile IP

Wireless Mobile IP. CCRI ENGR 1500. Mobile IP Components. MN – Mobile Node (VMD) FA – Foreign Agent (MAP) HA – Home Agent (MAP) AAP – Authoritative Access Point MAP – Mobile IP Access Point (MN) VMD – Visiting Mobile Device (MN) COA – Care-of-Address HAN – Home Agent Network

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Wireless Mobile IP

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  1. Wireless Mobile IP CCRI ENGR 1500 CCRI J. Bernardini

  2. Mobile IP Components MN – Mobile Node (VMD) FA – Foreign Agent (MAP) HA – Home Agent (MAP) AAP – Authoritative Access Point MAP – Mobile IP Access Point (MN) VMD – Visiting Mobile Device (MN) COA – Care-of-Address HAN – Home Agent Network FAN – Foreign Agent Network CN – Correspondent Node CCRI J. Bernardini

  3. Subnets and Mobile IP • Subnets provide many advantages: • make network management easier • Subnets reduce broadcasts • Subnets provide security • Subnets use subnet masks (255.255.255.0) • WLAN subnets creates problems for roaming devices • Example: • 192.146.118.20 /24 can seamlessly roam within 192.146.118.x /24 • Note /24 is a 255.255.255.0 subnet mask • 192.146.118.20 /24 can not seamlessly roam within 202.165.200.x /24 without changing the IP address • Mobile IP offers a solution • 192.146.118.20 can roam as a “guest” on the 202.165.200.x network CCRI J. Bernardini

  4. Mobile IP Devices • Visiting Device • Some APs support Mobile IP and Visiting devices • Mobile IP Access Point • Performs all Mobile IP services • Home Agent • Visiting devices home router • Tunnels packets from “visited” network to “visiting” device • Authoritative Access Point (AAP) • Uses a subnet map to track all home “visiting” devices • Foreign Agent • A router the is the attachment point for “visiting” devices • Tunnels packets to the Home Agent for the “visiting” device CCRI J. Bernardini

  5. Mobile IP Process - Discovery Mobile IP 3-Step Process 1-Discovery 2-Registration 3-Tunneling 2 MN – Mobile Node FA – Foreign Agent HA – Home Agent 3 1 4 1- Mobile Node (MN) gets address from Home Agent (HA) 2- MN moves to Foreign Agent (FA ) network 3- MN discovers FA or solicits for an agent. 4- MN gets Care-of-Address (COA) from FA CCRI J. Bernardini

  6. Mobile IP Process - Registration Mobile IP 3-Step Process 1-Discovery 2-Registration 3-Tunneling 5 10 7 12 8 6 9 MN – Mobile Node FA – Foreign Agent HA – Home Agent CN – Correspondent Node 11 5- MN send registration request to FA 6- FA checks request, adds MN to pending list 7- FA relays request to HA 8- HA checks request and creates a mobile binding 9- HA sends registration reply to FA 10- FA checks reply and adds MN to visitor list and relays reply to MN 11-FA creates a routing entry and tunnel to HA 12- MN check reply and creates a tunnel to the HA Through the FA CCRI J. Bernardini

  7. Mobile IP- Tunneling and Packet Forwarding MN – Mobile Node FA – Foreign Agent HA – Home Agent CN – Correspondent Node COA- Care-of-Address 13 14 15 13- Correspondent Node (CN) sends packet to MN and is routed to HA 14- HA intercepts packets and tunnels to the FA using the COA 15- FA relays the packets to the MN CCRI J. Bernardini

  8. Mobile Node Movement CCRI J. Bernardini

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