1. Computer Networks
Mobile IP

2. Motivation
With the advent of popular wireless technologies (e.g. cellular phones), a wireless IP device moving between networks means that the host’s address must change or that routers must propagate host specific routes across the entire internetwork. Neither of these solutions work well, enter Mobile IP.

3. Mobile IP Basics Home Address Mobile/Roaming IP Address Home Agent
Home Network
Foreign Network
Foreign Agent (care-of address)

4. Usage Registration Encapsulation Routing Performance
Triangular routing
Crossing paths
Performance

5. Mobile IP Illustrated

6. Challenges Privacy NAT (again!)
Triangular routing exists as long as there are legacy IPv4 stacks deployed
Routes aren't the only thing that change
Many people don't see this happening