In transport mode, the IP addresses in the outer header are used to determine the IPsec policy that will be applied to the packet. It operates in Transport and Tunnel Mode. A VPN "tunnel" is the encrypted connection a VPN establishes so that traffic on the virtual network can be sent securely across the Internet. IPsec provides data integrity, basic authentication and encryption services to protect modification of data and unauthorized viewing by using Authentication Header (AH), Encapsulating Security Payload (ESP) and Internet Key Exchange (IKE) protocols.I have prepared the following diagrams which is specific to Lab topology. Before going into the Lab topology I would like brief about the IPsec VPN Tunnel formation and the type of messages exchanged in IKE Phase -1 and IKE Phase-2.
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