What happens in Phase 1 of IPSec VPN?
IKE phase 1 performs the following functions: Authenticates and protects the identities of the IPSec peers. Negotiates a matching IKE SA policy between peers to protect the IKE exchange. Performs an authenticated Diffie-Hellman exchange with the end result of having matching shared secret keys.
What are the 6 messages on main mode of IPSec?
The Initiator (device which initiates IPSec) proposes policies by sending one or more Security Association proposals. IKEv1 Main Mode Message 1 contains IKE header, SA payload, Proposal payload, and Transform payload.
What are the messages in IPSec?
To build the VPN tunnel, IPSec peers exchange a series of messages about encryption and authentication, and attempt to agree on many different parameters. This process is known as VPN negotiations. One device in the negotiation sequence is the initiator and the other device is the responder.
What is the difference between IPSec Phase 1 and Phase 2?
Phase 1 Security Associations are used to protect IKE messages that are exchanged between two IKE peers, or security endpoints. Phase 2 Security Associations are used to protect IP traffic, as specified by the security policy for a specific type of traffic, between two data endpoints.
What is the purpose of 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 is IKE lifetime?
IPsec VPNs using IKE utilize lifetimes to control when a tunnel will need to re-establish. This secondary lifetime will expire the tunnel when the specified amount of data is transferred. Cisco Meraki products, by default, use a lifetime of 8 hours (28800 seconds) for both IKE phase 1 and IKE phase 2.
What is IKEv1?
Internet Key Exchange (also known as IKE, IKEv1 or IKEv2) is a protocol that is used to generate a security association within the Internet Protocol Security protocol suite.
Does IKEv2 support aggressive mode?
This process supports the main mode and aggressive mode. Main mode uses six ISAKMP messages to establish the IKE SA, but aggressive mode uses only three. Compared with IKEv1, IKEv2 simplifies the SA negotiation process. IKEv2 uses two exchanges (a total of 4 messages) to create an IKE SA and a pair of IPSec SAs.
Is IKE a Phase 1?
IKE supports multiple authentication methods as part of the phase 1 exchange. Methods include: Pre-shared keys. A key value entered into each peer manually (out of band) and used to authenticate the peer.
How does IKE protocol work?
The IKE works in two steps. IKE provides three different methods for peer authentication: authentication using a pre-shared secret, authentication using RSA encrypted nonces, and authentication using RSA signatures. IKE uses the HMAC functions to guarantee the integrity of an IKE session.