Select an arbitrary port that will be used for all VPN traffic to this MX (e.g. We are using Static NAT so we should be good here.Ģ. This will keep the public IP address seen by the VPN registry consistent. If using a load balancer, or NAT across multiple public IP addresses, map traffic from the internal address of the appliance to a single public IP address. Shouldn't static NAT eliminate this issue? Doesnt static NAT maintain the original source ports (UDP in this case)?ġ. When the registry servers see different source ports, the NAT unfriendly error will appear: Notice that the first connection is changed to port 56125 while the second is instead 56126. In this example the upstream firewall rewrites the source port for each outbound connection differently. ![]() Meraki troubleshooting documentation states the following cause and solutions: The appliance is behind a VPN-unfriendly NAT, which can be caused by upstream load balancers or strict firewall rules. The meraki can talk to the other meraki device outside of our network, but it cannot establish the VPN connection. The Meraki device behind our firewall is configured with static NAT. We have firewall rules in place to allow all traffic to and from the Meraki, these are working. ![]() The Meraki uses UDP hole-punching to establish the VPN. ![]() Attempting to setup a Cisco Meraki VPN behind our Checkpoint appliance running R77.30.
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