You are at a restaurant eating lunch with a friend. After the meal, your friend realizes they left their wallet at home. Your friend gives you a piece of silver….
If IPSec provides security at the network layer, why is it that security mechanisms are still needed at layers above IP?
The first limitation is that it only provides coarse form policy management support, and takes the decision without the knowledge of application context (Arkko and Nikender 2005, p. 242). The policy selector of IPsec is composed of only tuple of source /destination addresses, port number and transport protocol type……