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Traffic not getting through NAT traversal VPN - LAN to LAN

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Article ID: KB6130 KB Last Updated: 28 Jun 2010Version: 4.0
Summary:

Symptoms:
Environment:
  • NetScreen firewall without NAT has static assigned IP address
  • LAN to LAN VPN
  • One NetScreen behind NAT device, other has no NAT device in front of it
Symptoms & Errors:
  • Pings not getting through NAT traversal VPN
  • VPN not working with NAT traversal

Solution:
 
NetScreen behind NAT device:
Specify a local id when configuring the IKE Gateway
 
NetScreen without NAT device:
Specify Dynamic Gateway, peer id= local id used when specifying IKE gateway on the NetScreen behind NAT device
 
NS A NS B
Local ID: NSA Peer ID: NSA
 
Initiate traffic from the NetScreen behind the NAT device (NS A), and the NetScreens will begin its negotiation of Phase 1 and Phase 2 IKE.  It will generally take longer for the IKE negotiation phase to complete, as it requires more messages to verify the gateway behind the NAT device.
 

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