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Internet Key Exchange (IKE) is a standard protocol used to set up a secure and authenticated communication channel between two parties via a virtual private network (VPN). The protocol ensures security for VPN negotiation, remote host and network access.

Phase 1 establishes an IKE Security Associations (SA) these IKE SAs are then used to securely negotiate the IPSec SAs (Phase 2). Data is transmitted securely using the IPSec SAs.

Using IKE to negotiate VPNs between two endpoints provides more security than the manual key exchange. Manual key exchange?IPsec supports using and exchanging of keys manually (example: phone or email) on both sides to establish VPN.

IKE SAs versus IPSec SAs IKE SAs describe the security parameters between two IKE devices, the first stage in establishing IPSec. IPSec SAs pertain to the actual IPSec tunnel, the second stage. At the IKE level, a single IKE SA is established to handle secure communications both ways between the two peers.

IKE or Internet Key Exchange protocol is a protocol that sets up Security Associations (SAs) in the IPSec protocol suite. And, ISAKMP or Internet Security Association and Key Management Protocol is a protocol that is used to establish SA and cryptographic keys.

Internet Key Exchange version 2 (IKEv2) is a tunneling protocol, based on IPsec, that establishes a secure VPN communication between VPN devices and defines negotiation and authentication processes for IPsec security associations (SAs).

The IKE protocol uses UDP packets, usually on port 500, and generally requires 4?6 packets with 2?3 round trips to create an ISAKMP security association (SA) on both sides. The negotiated key material is then given to the IPsec stack.

IKE negotiates SAs for IPsec and delivers negotiated parameters and generated keys to IPsec. IPsec uses the SAs set up through IKE negotiation for encryption and authentication of IP packets.