Question:

a) Consider the following MIP scenario.

Quite a few enterprise networks use private addresses and NAPT for the communication to the Internet.

i. Discuss the impact of NAPT on MIP for a scenario when the FA and the MN are situated behind a NAPT and the HA in the ‘public' network part.

ii. Which are the potential messages that could be affected?

iii. Propose a solution?

b) Assuming the communication between the MN and the HA in the figure in a) is protected via IPsec in the tunnel mode, tabulate corresponding Policy Database and the Security Association Database.

c) Why is a dynamic key management mechanism in the context of MIP and IPsec essential?

d) Redesign the network topology above in a) to show how the AAA server and the Radius / Diameter protocols could be a solution to c).