I am trying something a little different with a new network I am building out.
Since the UCM has routing features and this is a very small network, I decided to try the UCM as the primary router in the network.
Everything has already been configured and setup and it has been working pretty well except for one minor thing.
Some info on the design.
ISP router is bridged to allow the external IP to be assigned to the WAN port of the UCM.
UCM is powered via a POE cable on the LAN port.
UCM is handling DHCP but there is a server in the network that handles DNS and the UCM is set as a secondary DNS. So the 4 clients PCs have their primary DNS as 192.168.100.2 (internal server) and secondary DNS as 192.168.100.1 (UCM).
All the internal services are setup and configured properly.
From within the network I can see CCTV and other services no problem.
The only issue is that if i am connected to the local wifi, I can’t access any internet services using the public IP.
Eg my CCTV… I can connect to the CCTV feed from anywhere outside the office, using the public IP. But if connect to the local WiFi, I can no longer connect to the CCTV using the external IP.
This problem is called NAT loopback or NAT Hairpinning. Does anyone know how to resolve that with the UCM gateways/routers?