Port Forwarding with the Spectre RT Industrial Router
Computer1 is on a 10.10.10.0 255.255.255.0 corporate network. Computer2 is on a 192.168.1.0
255.255.255.0 private network and has a static IP address of 192.168.1.10. Computer1 is using a
Modbus Master Simulator and computer2 is using a Modbus Slave Simulator. Computer1 wants to poll
information from computer2 but are on different subnets.
Computer2
Computer1
Modbus Slave
Modbus Master
10.10.10.1
192.168.1.1
IP:192.168.1.10
Secondary LAN/WAN
Primary LAN
Open a connection to the router’s internal web page. Under LAN configuration, Primary LAN is our ETH
port and Secondary LAN is our Port1. Port1 is to be used as the WAN interface.
Under NAT Configuration we need a port forward rule for traffic that is sent to Port1 IP address
10.10.10.1 on port 502 to be forwarded to our computer2 IP address 192.168.1.10.
Once these changes are applied we should now be able to open our Modbus Master Simulator and start
a connection to IP address 10.10.10.1 on port 502 and communicate with computer2 IP address
192.168.1.10.