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You'll need to create a firewall rule allowing inbound access on the firewall protecting the destination environment. You should definitely create a point-to-point rule that limits inbound access to the source IP address of the other tunnel endpoint; regardless, this rule still allows some extra degree of inbound access. When you have the choice of adding complexity to a less sensitive or more sensitive environment, you should opt to add it to the less sensitive environment.
Remember that complexity is the enemy of security: it makes verification of security controls more difficult and increases the likelihood of a configuration error. Adding the inbound rule to the less secure environment increases the complexity of that environment rather than the more secure one.
Dig Deeper on Network Firewalls, Routers and Switches
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