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« Last post by 9V1SA on 2024-01-19, 15:01:54 »
Thanks for your swift and clear advice, Mike.
On Port 23 - noted. I'm reading User manual Rev. A40 – 2019 sept 18 and page 237 appears ambiguous on whether Port 23 should be on or not. I will turn it off following your advice.
I confirm SIP ALG is disabled on both routers. Also the ISP at the radio end does not appear to be using CGN because the external IP address listed on the RRC radio page matches the IP address from whatsmyip.org. I have tried both port forwarding and using the DMZ on the radio side and the behaviour is the same. In both cases, when I scan the radio end IP address for UDP ports 13000-13002 using pentest-tools.com/network-vulnerability-scanning/udp-port-scanner-online-nmap it does not detect those ports open.
However, in the idle state the two RRCs are clearly connected on some level because the radio RRC's 'other party' IP address matches the IP address at the control end. Also, when I press the power on button on the IC-7100 front panel, the yellow LEDs next to the AUX/MIC connectors on the RRCs at both ends of the link come on for about 1.5 seconds at the same time. During the time the yellow LEDs are on, if I do a screen grab of the Radio RRC status page it says it is connected - see pdf attached which shows both the idle state and the state when the yellow LED is momentarily on.
Does this still look like a router configuration issue?