It took me a while to get my head around this one, as I had been using identical ports with several Flex-6000 radios – but with one big caveat: In my past usage only one radio per site was powered up at the same time.
It didn’t work when I wanted to leave more than one radio running at my main QTH.
Obviously my configuration was creating conflicts, as basically I’d considered each radio to be interchangeable without properly setting them up to be simultaneous with each other.
Time to do some research and ask for some guidance.
Quick executive summary for those readers who need results right away:
Assign a different pair of external ports for each radio through each radio’s SmartLink setup. The internal port pairs remain UDP 4993 and TCP 4994 for every radio.
Usually you will want to assign your radios a static internal network IP address, but it is best to do this through a MAC address binding in “Static Lease” (also called “DHCP Reservation”) at your router.
Then create separate Port Forwarding rules for each radio‘s pair of ports in your Router, using your SmartLink configured external and internal pairs with their protocols and your router configured Static Lease IP address.
Internally your radios use UDP 4993 and TCP 4994. This Port Address pair is the same for each Flex-6000.
But what you use Internally can be translated/mapped to a different External Port Address.
Externally your radio can use whatever port number you configured them for, once it is translated.
FlexRadio Systems Notes on Port Forwarding (courtesy FRS Dan N7HQ)
The translation/mapping is called “Port Forwarding” and basically hooks an external port to an internal port. Think of the old fashion telephone operator where they physically plugged your call to the recipient’s phone.
A port is configured to communicate with a protocol. Think modulation or mode if you are thinking radios.