In the PC with our interface Net512
- find the IP of the internet modem where our interface Net512 is (you can use "https://whatismyipaddress.com/" to know this IP)
- in the router, open the port 7349 for external communication (by default all unused ports are blocked)
In the PC with our software
- enter the IP in our software (main menu "Preferences" > tab "Hardware" > check "Enable Ethernet interfaces" > section "1")