Internet Key Exchange Protocol Version 2 (IKEv2)
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C. Kaufman, P. Hoffman, Y. Nir, P. Eronen, T. Kivinen · 2014-10
Abstract
This document describes version 2 of the Internet Key Exchange (IKE) protocol. IKE is a component of IPsec used for performing mutual authentication and establishing and maintaining Security Associations (SAs). This document obsoletes RFC 5996.
Why This RFC Matters
RFC 7296 elevated IKEv2 to Internet Standard status, recognizing it as the definitive key exchange protocol for establishing IPsec Security Associations. IKEv2 dramatically simplified the IKEv1 state machine from 9 message exchanges down to 4 initial messages, added EAP support for flexible authentication, built in NAT traversal (NAT-T), and introduced MOBIKE (RFC 4555) for mobility. Every enterprise VPN gateway, mobile device VPN client, and site-to-site tunnel built after 2005 uses IKEv2 as the control plane for IPsec, making this RFC one of the most operationally significant security standards on the internet.