I can't open any ports. My PC (Windows 10) is connected to a router and then to an ONU. I want to open some ports for playing online games. I tried turning on DMZ, forwarding ports and everything and I also disabled firewall on Windows but the ports are still closed. When I traceroute I can see two private IP addresses. When I connect the ONU directly to the PC I can't access the internet and also can't access its settings using gateway address in web browser. How can I solve it?