4/1/2017 Wireless Mobile IP CCRI ENGR 1500 CCRI J. Bernardini

Mobile IP Components MN – Mobile Node (VMD) FA – Foreign Agent (MAP) 4/1/2017 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

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

Mobile IP Devices Visiting Device Mobile IP Access Point Home Agent 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

Mobile IP Process - Discovery 4/1/2017 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

Mobile IP Process - Registration 4/1/2017 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

Mobile IP- Tunneling and Packet Forwarding 4/1/2017 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

4/1/2017 Mobile Node Movement CCRI J. Bernardini