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Port Forwarding Issues - Remote Connection

Working with a radio that is in a semi remote location. The only internet option is 4G via EE which provides good speeds and latency, but is behind carrier grade NAT (CG-NAT). This means its not possible to open ports directly (either via UPnP or manually) and remote access does not work.

As a fix there is a pfsense router that forwards all radio traffic (both for the receiver and head end for the FLEX-6600M) over a VPN to cloud server. This server has the 21000 tcp and 22000 udp ports open and forwarded to the radio head end (the pfsense has a firewall rule to forward 21000 to 4994 and 22000 to 4993 respectively). Doing an external port scan of the cloud server IP shows both ports as "open" when the radio is on.

However I can not get smart link to connect when outside the local network. Has anyone had the same experience and is there anything being done wrong?

Best Answer

  • runtimesandbox
    runtimesandbox Member
    Accepted Answer
    Have managed to resolve this. I was mapping the external port to the internal port (22000 ---> 4994 tcp) on the firewall, which whilst tested okay in the SDR software didn't allow it to connect.

    Doing a direct port all the way through has solved the issue

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