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First post here.

I've recently moved into an area where there's only one ISP. I had a file server running on my Windows based machine (FileRun) which was working seamlessly. I had configured a port forwarding on my router for port 8000 and configured my Windows Firewall to accept incoming connections from this port. Everything worked.

Ever since I moved to the new ISP, my file server has stopped working. I did some fidgeting and found out all my incoming ports are blocked. I rechecked my firewall and router settings, all seems OK. So I started pointed finger to my ISP that it might be blocking all incomings.

I've written a detailed email to their technical support and this is what they reply:

Kindly be informed that services are connected on GPON platform where broadband session is normally terminated on ONT & devices will get private IP’s & not public IP. If you want public IP on your device than you should purchase static IP from DU(we will configure port4 of the ONT in Bridge mode ).

This is too technical for me. I merely asked them if they were blocking the incoming ports or not, and that my server stopped working after I subscribed their service.

Can anyone help interpret the ISP's response as to what it means? I know they're forcing me to purchase their static IP service, but thats not my problem. I just need an incoming port. I use DuckDNS to resolve my IP.

Thanks

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2 Answers 2

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What they have done is that they have set up Carrier Grade NAT (CGN). Simply explained you are behind a big router shared with all the other subscribers.

If they were to open e.g. port 8000 for you, they would have to forward the port from the one external IP you all share to your IP, and this could not be done for others - for that reason there are no open ports.

If you get a static IP you would no longer be behind the CGN, and you could manage ports as you want to.

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  • Thanks very much. Just as an additional question, would it be considered making my system more approachable by perpetrators if I'm assigning static public IP to my system? I use the plain simple Windows Firewall.
    – Faraz Azhar
    Commented Jan 18, 2017 at 16:14
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You are connected to the network through the NAT.

Your service will not work with this connection. If you want to connect to your server from the Internet, you must purchase "public IP address" service from a your ISP.

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