“WAN” should be already set in the “Interface” dropdown since you are on the WAN interface firewall rule page. The “Action” should be “Pass” to allow the connection. One example of a WAN rule would be to access your WireGuard VPN running on OPNsense.
If you have a Plex Media Server or Nextcloud on a server in your network and want to open access to the outside world, you will want a NAT Port Forward rule. If you run OpenVPN or WireGuard in OPNsense, you will want a WAN rule. Generally speaking, WAN rules should be used for any service running directly on your router and NAT port forward rules for any service host on a server in your internal network (either virtualized or physical). Knowing when to use a WAN rule versus a NAT Port Forward rule may be confusing to new users. WE ASSUME NO LIABILITY AND ARE NOT RESPONSIBLE FOR ANY MISUSE OR DAMAGE CAUSED BY THE USE OF THE INFORMATION ON THIS PAGE.Understanding how to forward ports and create firewall rules for the WAN interface of your router is important if you wish to access services hosted on your router or a server in your internal network. IT IS YOUR RESPONSIBILITY TO OBEY ALL APPLICABLE LOCAL, STATE AND FEDERAL LAWS. THE INFORMATION ON THIS PAGE IS STRICTLY FOR INFORMATIONAL PURPOSES ONLY. ISPs block this port to reduce the amount of spam generated by worms on infected machines within their network. Port 25 is the default port for sending and receiving mail. With blocked port 80 you will need to run your web server on a non-standard port. Port 80 is the default port for http traffic. The most commonly blocked ports are port 80 and port 25. Most residential ISP's block ports to combat viruses and spam. Please refer to your routers manual or manufacturer for assistance in setting up port forwarding. This utility can verify the success of that process. When you forward a specific port on your router, you are telling your router where to direct traffic for that port. In a typical network the router has the public IP address and computers/servers obtain a private IP address from the router that is not addressable from outside the network. This allows you to run a web server, game server or a service of your choosing from behind a router. Port forwarding or port mapping allows remote computers to connect to a specific computer or service on a private network.
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