IKE_SA_INIT is the initial exchange in which the peers establish a secure channel. In effect, IKEv2 has only two initial phases of negotiation: There is no Aggressive Mode or Main Mode. Any subsequent traffic that matches other proxy identities then triggers the CREATE_CHILD_SA exchange, which is the equivalent of the Phase 2 exchange in IKEv1. This SA is only built for the proxy identities that match the trigger packet. IKEv2 combines the Phase 2 information in IKEv1 into the IKE_AUTH exchange, and it ensures that after the IKE_AUTH exchange is complete, both peers already have one SA built and ready to encrypt traffic. At worst, this can increase to as many as 30 packets (if not more), depending on the complexity of authentication, the number of Extensible Authentication Protocol (EAP) attributes used, as well as the number of SAs formed. At best, it can exchange as few as four packets. In IKEv1, there was a clearly demarcated Phase 1 exchange, which contains six packets followed by a Phase 2 exchange is made up of three packets the IKEv2 exchange is variable. This diagram provides a comparison of the two exchanges: While Internet Key Exchange (IKEv2) Protocol in RFC 4306 describes in great detail the advantages of IKEv2 over IKEv1, it is important to note that the entire IKE exchange was overhauled. Refer to Cisco Technical Tips Conventions for more information on document conventions.
#DECRYPTED PACKET FAILED SA IDENTITY CHECK CISCO JUNIPER SOFTWARE#
This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. The need and intent of an overhaul of the IKE protocol was described in Appendix A of Internet Key Exchange (IKEv2) Protocol in RFC 4306. Adoption for this protocol started as early as 2006. IKEv2 is the second and latest version of the IKE protocol. IKE is the protocol used to set up a security association (SA) in the IPsec protocol suite.
This document describes the advantages of the latest version of Internet Key Exchange (IKE) and the differences between version 1 and version 2.
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