Standards Status
IPsec was developed in conjunction with IPv6 and must be available in all standards-compliant implementations of IPv6 although not all IPv6 implementations include IPsec support; it is optional for IPv4 implementations. However, because of the slow deployment of IPv6, IPsec is most commonly used to secure IPv4 traffic. IPsec protocols were originally defined in RFC 1825 and RFC 1829, published in 1995. In 1998, these documents were superseded by RFC 2401 and RFC 2412 with incompatible aspects, although they were conceptually identical. In addition, a mutual authentication and key exchange protocol Internet Key Exchange (IKE) was defined to create and manage security associations. In December 2005, new standards were defined in RFC 4301 and RFC 4309 which are largely a superset of the previous editions with a second version of the Internet Key Exchange standard IKEv2. These third-generation documents standardized the abbreviation of IPsec to uppercase “IP” and lowercase “sec”. It is unusual to see any product that offers support for RFCs 1825 and 1829. “ESP” generally refers to RFC 2406, while ESPbis refers to RFC 4303.
Since mid-2008, an IPsec Maintenance and Extensions working group is active at the IETF.
Read more about this topic: IPsec
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