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

2. 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

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

4. 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

5. 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

6. 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

7. 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

8. 4/1/2017
Mobile Node Movement
CCRI J. Bernardini