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Before you can start configuring VPN tunnels you must specify which network interface should be a VPN end point. If the Gibraltar firewall is behind another firewall that implements NAT, you must additionally activate the option "NAT traversal". If you do not have a static external IP address you must select the option "Via default route".
ATTENTION: If you use NAT Traversal, the remote station has to open the UDP port 4500.
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