I am using HL7618RD on an embedded Linux board (Debian 9 Linux) and have successfully connected to Internet using CDC/NCM on USB. My data plan gives me a static IP and I can connect to any website without any issue.
My issue is with the incoming traffic. If I ping my board using the public static IP, I get no reply. Same goes for the web server running on the Linux board or the SSH server running.
It is as if all ports in the HL7618RD are blocked.
There is no firewall running on the Linux system. By the way, if I connect via the Ethernet port, then I can ping and SSH into the board.
I can’t seem to find any documentation on unblocking the ports in the module.
Any help you guys can provide is much appreciated.