IKE Version Mismatch ,Security Association Negotiation Failure ) Step-3:( Phase-1 Troubleshooting, Pre-shared Key, Encryption, Auth Algorithm. Important point to be noted here is SPI field which points to the respective Encryption and Authentication Algorithms. In tunnel mode, New IP header is added to provide extra layer of protection by defining Security policy to the inner IP packet.įollowing diagrams are self explanatory regarding the IPsec process that happens in Phase-1 & Phase-2.Different fields in AH Header and ESP header are depicted. 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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