Trouble with port forwarding - Technicolor DPC3941B
New here, and I am hoping I'm on the correct forum, so here goes:
A client recently upgraded their Comcast Business Internet (which I guess required a different modem over the older SMC modem prior to upgrading ... and which I am much more familiar with). The 'new' modem is a Technicolor DPC3941B, and as I explore the controls interface looking to establish port forwarding, it appears I'm not able to accomplish this properly
The 'app' we intend to use is called NetOp Remote Control and requires port 6502 UDP/TCP ('normal' but also assignable) to be 'port forwarded' to a statically assigned internal address in order to accomodate external traffic to reach the "gateway module". This 'gateway module' then routes traffic to other internal PCs which also use port 6502 UDP/TCP.
In the past, I've normally statically assigned an internal LAN address to the network interface on the system operating the 'gateway module' (operating on a Windows Server 2012 R2 system) which has operated well in the past. All other internal devices are using DHCP issued from the modem/router, currently the 'new' DPC3941B
I've attempted to configure this on this 'new' Technicolor modem by doing as I always have done in the past, by simply assigning this port forwarding rule via IPv4 to the static address of the gateway device, but it appears that this does not seem to work. Must I also configure IPv6 or is this actually something that only Comcast can accomodate? I've seen some reference to this requirement on other sites, so just thinking I'll need to call Support and ask them to achieve the necessary 'forwarding'...
Or maybe I'm missing something here..?