IKE use different types of "Payloads" to share information about common Security Associations and Keys. IKEv1 Main Mode Message 1 contains IKE header, The Initiator (device which initiates IPSec) proposes policies by sending one or more Security Association proposals. IKEv1 Phase 1 Main Mode - Message 1: IKEv1 Main mode first message pair consists of the IKEv1 Security Association proposals. The Security Associations (SAs) negotiated in Phase 1 is then used to protect future IKE communication.įollowing explanation is based on the assumption that the peers are using Pre-Shared Key for authentication. Phase 1 is used to negotiate the parameters and key material required to establish IKE Security Association (SA) between two IPSec peers. The purpose of IKEv1 Phase 2 is to establish IPSec SA. IKEv1 Phase 2 (Quick Mode) has only three messages. The purpose of IKEv1 Phase 1 is to establish IKE SA. IKE Phase 1 Aggressive Mode has only three message exchanges. IKEv1 Phase 1 Main mode has three pairs of messages (total six messages) between IPSec peers. IKEv1 Phase 1 negotiation can happen in two modes, either using Main Mode or using Aggressive Mode. IKEv1 Phase 2 SA negotiation is for protecting IPSec (real user traffic). IKEv1 Phase 1 SA negotiation is for protecting IKE. 1) Phase 1 (IKE SA Negotiation) and 2) Phase 2 (IPSec SA Negotiation). The operation IKEv1 can be broken down into two phases. ISAKMP protocol is a framework for exchanging encryption keys and security association payloads. Internet Key Exchange is a hybrid protocol made from Oakley, SKEME (A Versatile Secure Key Exchange Mechanism for Internet) and ISAKMP (Internet Security Association and Key Management Protocol) protocols. Internet Key Exchange (IKE) is an IETF protocol and it has two versions, an old version IKEv1 ( RFC 2409, RFC 4109) and a relatively new version, IKEv2 ( RFC 5996, RFC 7296 and RFC 7427). Using Internet Key Exchange (IKE), IPSec Security Associations (SAs) can be dynamically established and removed at a negotiated time period. Internet Key Exchange allows IPSec peers to dynamically exchange keys and negotiate IPSec Security Associations (SAs). Internet Key Exchange (IKE) is a protocol used to set up a IPSec Security Associations (SAs) security attributes like encryption key, encryption algorithm, and mode, between IPSec peers.
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