Contents
Why do we need two phases in IPSec?
The purpose of Phase 2 negotiations is to establish the Phase 2 SA (sometimes called the IPSec SA). The IPSec SA is a set of traffic specifications that tell the device what traffic to send over the VPN, and how to encrypt and authenticate that traffic.
What is IKE Phase 2?
The purpose of IKE phase 2 is to negotiate IPSec SAs to set up the IPSec tunnel. IKE phase 2 performs the following functions: Negotiates IPSec SA parameters protected by an existing IKE SA. Establishes IPSec security associations.
What is the standard for IKE?
Internet Key Exchange (IKE) is the standard used for remote host, network access, and virtual private network (VPN) access. IKE enables two parties on the Internet to communicate securely. Specifically it is a key management protocol used to set up a security association (SA) using Internet Protocol Security (IPsec).
What are the functions of IKE phase 2?
IKE phase 2 performs the following functions: IKE phase 2 has one mode, called quick mode. Quick mode occurs after IKE has established the secure tunnel in phase 1. It negotiates a shared IPSec policy, derives shared secret keying material used for the IPSec security algorithms, and establishes IPSec SAs.
What do you need to know about Ike?
The IKE protocol is very flexible and supports multiple authentication methods as part of the phase 1 exchange. The two entities must agree on a common authentication protocol through a negotiation process. IKE phase 1 has three methods to authenticate IPSec peers in Cisco products: Pre-shared keys.
What happens in Phase 1 of IPsec IKE?
Phase 1 consists of main mode or aggressive mode. (These modes are described later in this article.) Potential peers in an IPSec session must authenticate themselves to each other before IKE can proceed. Peer authentication occurs during the main mode exchange during IKE phase 1.
What is the Diffie-Hellman key agreement in Ike?
In phase 1 of this process, IKE creates an authenticated, secure channel between the two IKE peers, called the IKE security association. The Diffie-Hellman key agreement is always performed in this phase. In phase 2, IKE negotiates the IPSec security associations and generates the required key material for IPSec.