I have an ISP provided router modem (BT Smart Hub TypeA) that everyone at home connects to (wifi and cabling) and I want to leave this as is, so it remains as the DHCP, using 192.168.0.x/255.255.255.0 as the subnet and mask, with NAT. I also have a Netgear DGND3700 connected (it’s WAN Port) to the BT Router (LAN port1) using a static IP (192.168.0.253) for the Netgear, set on the BT. I turned on the DMZ setting on the BT router and configured the DMZ to use the static IP (192.168.0.253) of the Netgear router. The Netgear LAN settings have a different IP range to the BT router (192.168.1.x/255.255.255.0) and have DHCP and NAT enabled.
The plan is to connect ‘smart’ appliances and cheap Chinese internet enabled devices to the Netgear in the DMZ so that they can reach the Internet, not see/access the home network (192.168.0.x) and avoid double NAT.
Everything connects well and can see the internet from both routers, no complaints from the kids on the BT router and the Netgear, and it’s devices, access the internet fine.
My problem is that when I connect to the Netgear, my computer/phone gets a Netgear IP address but can still access devices on the other subnet. The whole purpose was to prevent devices on the Netgear from seeing devices on the BT router.....and I assume not even be able to access the BT router.
What am I doing wrong? Please help....it’s driving me nuts changing settings and getting nowhere!!!