MicroNugget: How to Negotiate in IKE Phase 1 (IPsec)

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In this video, Keith Barker covers the five essential items for negotiating IPsec's IKE Phase 1. The best way to make sure your site-to-site tunnels get built is to remember to HAGLE: make sure your HASH, Authentication, Group, Lifetime and Encryption are negotiated and agreed on.

If you have two internal networks that you need to talk to one another securely across the Internet via two ASAs, IPsec is a great way to implement your site-to-site tunnel.

Before the devices will establish the tunnel, you need to negotiate IPsec's IKE Phase 1. There are 5 items. To remember each step, Keith's recommended method is "HAGLE".

• H: Hashing algorithms to verify data integrity
• A: Authentication to verify one another
• G: Groups to generate secret keys
• L: Lifetime to determine how long the tunnel stands up
• E: Encryption to agree which algorithm to use

With these five items negotiated, your ASAs can stand up an IKE Phase 1 tunnel and connect your sites securely across the Internet.

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