I have the same setup with a router. I even tried using a switch to make sure the router was not blocking anything but no luck.

What might be tripping you up is double-NAT if you have the XOHM modem plugged into a router.

I was trying to do very similar things but could not get into my local network, only a single box connected directly to the XOHM modem set up as the DMZ, which quite frankly, I didn’t like.

So the XOHM modem provides NAT/DHCP to your router, then your router is doing the same thing for your LAN – no inbound traffic is going to hit your LAN in this config. Basically I told the XOHM techs that all I wanted to do was either a) turn off NAT/DHCP on the XOHM modem and pass the external IP to the router, or b) have the XOHM modem provide NAT/DHCP for my entire LAN, not just the router.

Long story short – all I had to do was plug the XOHM modem in the 1st LAN port on my router instead of the internet port. This basically lets the XOHM modem provide NAT/DHCP for my entire LAN now, as it overrides the NAT/DHCP on my router.I manually set up the router to have an address at the end of the address block that the XOHM modem was providing so I could administer it (even though it says the router isn’t connected to the internet, the clients are fine).

Once you get it set up so that the XOHM modem is providing NAT/DHCP for your LAN, then port forwarding should work as expected.

Hope this helps!