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    How to setup IPSEC tunnel with Watchguard Firebox with NAT-T enabled

    Scheduled Pinned Locked Moved IPsec
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    • T
      ttblum
      last edited by

      Hello,

      I currently have an IPSec tunnel setup between by pfSense 2.0 RC3 and a Watchguard Firebox.  The tunnel seems to be unstable, and the last time it went down I noticed the pfSense firewall was blocking UDP traffic on port 4500 - I believe UDP port 4500 is Nat-Traversal.

      I currently have a firewall rule on the WAN interface allowing UDP 500 traffic, do I also need to add a rule allowing UDP port 4500 traffic?

      Thanks,

      Todd

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      • L
        lint
        last edited by

        @ttblum:

        do I also need to add a rule allowing UDP port 4500 traffic?

        That depends on if you are using NAT-T.

        Look in your tunnel configuration to see if you have NAT Traversal enabled in pfSense.  It is in the advanced options at the bottom of the phase 1 policy.

        If both firewalls have NAT-T on, then you will need to allow access over UDP 4500, or disable it on both.

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