What is IKE SA and IPSec?
Bidirectional, simply means that a single SA is agreed upon and used to send and receive to the remote peer. The IKE SA is simply a “channel” not tunnel (no IPsec encap. type). The IPsec SA must be unidirectional (each peer has 2 SAs with separate keying material), 1 SA to send and 1 SA to recieve from the remote peer.
What is IKE SA and child SA?
They first establish an SA that securely carries IKE messages between the peers, and subsequently establish additional SAs to carry the protected ESP or AH traffic. For IKEv2, the SA that carries IKE messages is referred to as the IKE SA, and the SAs for ESP and AH are child SAs.
What is the role of SA in IPsec?
An IPsec security association (SA) specifies security properties that are recognized by communicating hosts. These hosts typically require two SAs to communicate securely. A single SA protects data in one direction. The protection is either to a single host or a group (multicast) address.
How does IPSec IKE work?
The basic purpose of IKE phase 1 is to authenticate the IPSec peers and to set up a secure channel between the peers to enable IKE exchanges. Performs an authenticated Diffie-Hellman exchange with the end result of having matching shared secret keys. Sets up a secure tunnel to negotiate IKE phase 2 parameters.
Which is Ike policy governs negotiation of IPsec SA?
If the IKE SA has been set up, the IKE SA governs negotiation of the IPSec SA as specified in the IKE policy configured by the crypto isakmp policy command, the packet is encrypted by IPSec, and it is transmitted.
What does Ike and IPsec SAs tear down mean?
It means that all IKE and IPsec SAs are torn down before recreating them. This will cause some interruptions during which no IPsec SAs are installed. If trap policies are used it could also trigger unnecessary acquires and hence duplicate IPsec SAs during that down time.
How to create an IPsec / IKE policy for Azure?
This article walks you through the steps to configure IPsec/IKE policy for VPN Gateway Site-to-Site VPN or VNet-to-VNet connections using the Azure portal. The following sections help you create and configure an IPsec/IKE policy, and apply the policy to a new or existing connection.
How to update IPsec / IKE policy for S2S VPN?
This section outlines the workflow to create and update IPsec/IKE policy on a S2S VPN or VNet-to-VNet connection: Create a virtual network and a VPN gateway. Create a local network gateway for cross premises connection, or another virtual network and gateway for VNet-to-VNet connection.