Click on Port Forwarding. Enter the IP address of your device in your router in the correct box. Put the TCP and UDP ports of the Modbus server in the boxes in your router. The default Modbus port number is 502. And then click the apply button. And youโ€™re done. Restart your router to let the changes take effect.
Page 106: Trigger Port Forwarding Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take turns using the service. The EMG2926-Q10A records the IP address of a LAN computer that sends traffic to the WAN to request a service with a specific port number and protocol (a "trigger" port).
First, ensure that your ZyXEL EMG6726-B10A router is powered on and broadcasting a Wi-Fi signal. Check if the Wi-Fi password is correctly entered on your devices. If the issue persists, try restarting the router and your devices. If necessary, perform a factory reset on the router and reconfigure it from scratch. Use an Ethernet cable to connect the WAN port to a gateway modem. Connect a computer to the LAN port using the yellow Ethernet cable (optional). Connect a USB memory stick for ๏ฌle sharing (optional).

Port Forwarding (NAT) - Configure Virtual Server / [Many] 1:1 NAT / Virtual Server Load Balancer; Instructions for setting up a hardware ZyWALL USG series gateway using a static IP address for connecting to the Internet; VPN Guideline - Choosing the right VPN-type for your Home-Office (+Useful Links & Tutorials)

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how to port forward zyxel