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How are IKE Phase 2 messages sent?

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Article ID: KB6394 KB Last Updated: 10 Jun 2010Version: 3.0
Summary:
How are IKE Phase 2 messages sent?
Symptoms:
IKE Phase 2 Quick Mode
Solution:

Note: This article applies to ScreenOS 4.0 and higher.

IKE Phase 2 messages are sent in the following manner:

Image of example

Message 1 and Message 2 contain an encrypted and authenticated exchange of hashes that contain information from Phase 1. The following Phase 2 proposal list is also included:

  • Encapsulating Security Protocol (ESP) or Authentication Header (AH)
  • Diffie-Hellman Group Number (0 for nopfs)
  • Encryption Algorithm
  • Authentication Algorithm
  • Key Lifetime
  • Proxy ID (Policy Rule)
  • Diffie-Hellman Public Keys (Optional if using PFS)

Message 3 acknowledges information sent from Quick Mode Message 2, so that a Phase 2 tunnel may be established.



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