RFC 2409 PDF

User-space daemons have easy access to mass storage containing configuration information, such as the IPsec endpoint addresses, keys and certificates, as required. Kernel modules, on the other hand, can process packets efficiently and with minimum overhead—which is important for performance reasons. The IKE protocol uses UDP packets, usually on port , and generally requires 4—6 packets with 2—3 round trips to create an SA security association on both sides. The negotiated key material is then given to the IPsec stack. For instance, this could be an AES key, information identifying the IP endpoints and ports that are to be protected, as well as what type of IPsec tunnel has been created.

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It is designed to be key exchange independant; that is, it is designed to support many different key exchanges. Oakley describes a series of key exchanges, known as modes, and details the services provided by each e.

SKEME describes a versatile key exchange technique which provides anonymity, repudiability, and quick key refreshment. IKEv2 does not interoperate with IKEv1, but it has enough of the header format in common that both versions can unambiguously run over the same UDP port.

This includes payloads construction, the information payloads carry, the order in which they are processed and how they are used. The relationship between the two is very straightforward and IKE presents different exchanges as modes which operate in one of two phases. Initiator SPI. A value chosen by the initiator to identify a unique IKE security association.

Responder SPI. A value chosen by the responder to identify a unique IKE security association. Next payload. Indicates the type of payload that immediately follows the header. Exchange type. Indicates the type of exchange being used. This constrains the payloads sent in each message and orderings of messages in an exchange. Indicates specific options that are set for the message. The presence of options is indicated by the appropriate bit in the flags field being set.

V, Version. Indicates that the sender is capable of speaking a higher major version number of the protocol than the one indicated in the major version number field. R, Response. Indicates that this message is a response to a message containing the same message ID. IPSec registry. IKEv2 Parameters.


Internet Key Exchange (IKE) Attributes



Internet Key Exchange


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