On October 29, 2020 at 07:48, highfigh said...
The gateway IP address found in cmd prompt was in a public IP range. I asked the installer where the modem is located and he said it's not needed, which sounds really odd.
Carrier Ethernet is common on the enterprise side. Modems are necessary for cable and DSL (and some other technologies), but this is straight Ethernet. You should be able to just plug your router into the Ethernet. I assume since you are getting a non-RFC1918 (outside the 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 ranges) that there’s nothing blocking ports upstream. The provider could NAT and block ports, but they generally do not. Especially if they’re providing a public IP. Your router will perform NAT and port forwarding for anything behind it. Are the port forwards already configured on your router?
