Specify Primary Interface for Hosts with Multiple NIC

I am running Channels DVR Server on my Synology and it seems I cannot get remote connectivity to work because Channels DVR appears to be trying to connect on wrong interface. Would be nice if I could select the NIC in question to listen on. I am seeing this behavior below. Network 192.168.1.X is the network with Internet access. 192.168.6.X is just a network I have between my systems for data transfer. I see the Synology listening on all interfaces for 8089.

Version: 2023.02.25.0726

2 interfaces
192.168.6.30, 192.168.1.147

Message: Configure (your router http://192.168.1.254/) to forward TCP external port 8089 to 192.168.6.30:8089

ON synology can't you set 1 NIC to be the default Gateway.

Don't use automatic/UPnP ... manually configure your router to forward to the 192.168.6/24 address.

Seems unlikely this is the cause. What exactly is happening?

Yeah I already discovered long ago upnp isn't supported by my router so I'm doing it manually. I am just confused about the message, it is saying the router on one network with the supposed listening IP on another network. I'm reviewing the port forwarding currently.

Just to be clear, locally everything works great. The whole issue is remote outside the network.

The message doesn't matter, it's just there as a suggestion on what to do.

Does portchecker.co show 8089 as open for your public IP?

See Troubleshooting: Away from Home access issues

Then you have a network/routing issue.

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