vpn - Is it possible to setup IPsec behind NAT without port forwarding? - Network Engineering Stack Exchange
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Port-forward through IPSEC Tunnel with PBR · Issue #4290 · opnsense/core · GitHub
Setting Up IPsec To Use NAT Traversal on Both Sides of the WAN,Setting Up IPsec To Use NAT Traversal on Both Sides of the WAN,Setting Up IPsec To Use NAT Traversal on
IPSEC ports/protocol numbers and UDP ports with NAT