Netgear LB2120 LTE Modem -> Netgear R6080 Router -> PC Port Forwarding setup

[wlai89]

I have a setup that consists of:

PC <--> AC1000/R6080 Router <---> LB2120 LTE Modem w/ Ting Wireless

The outbound flow from PC is working flawlessly.  I'm trying to setup a custom SSH port forwarding so that I can access the PC from remote but so far not successful.

I've set up Port Forwarding on the AC1000/R6080 to the PC's IP address (192.168.1.2) on the port 1234. 

With that in place, I've tried setting the LB2120 to either Bridge or Router Mode, and neither work. When LB2120 was in Router Mode I also enabled port forwarding of 1234 to the static IP address of the AC1000/R6080, which was 192.168.5.20

Duing all varitations that I've tested, outbound was working. What am I missing?  Thanks in advance.

[wlai89]

Oh just wanted to add that the SSH command I am using from an external machine (mac) was 

ssh machinename@<public IP address> -p 1234

where the public IP was obtained via googling "what is my ip".  It's something I've done many many times via terrestrial DSL/Cable modem setup, but never have done via an LTE Modem link.

Thanks in advance.