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How do I configure support for UDP 4500 (NAT-T Draft 2)?

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Article ID: KB8120 KB Last Updated: 11 Aug 2010Version: 6.0
Summary:
How do I configure support for UDP 4500 (NAT-T Draft 2)?
Symptoms:
Environment:
  • UDP 4500
  • NAT-T Draft 2
Solution:
Question: Customer wants to use NAT-T draft 2 UDP 4500; how do I configure the Firewall  to support this?

Answer:  NAT-T draft 2 is supported in ScreenOS 5.1 and later. 

To enable support for NAT Traversal, go to KB4022 - How Do I Enable NAT Traversal (NAT-T)?


The difference between ScreenOS 5.0  implementation and ScreenOS 5.1 and later is that NAT-T draft 2 can use UDP port 4500 for IKE negotiation when NAT is detected.  For more information about NAT-T Draft 2 please see article KB8119 - What is NAT-T draft 2 and how does the Firewall detect it?
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