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Originally Posted by PHines
the PC's are allocated 192.168.1.x addresses by the Netgear DHCP server. But, I was surprised to see that the Netgear was assigned a 192.168.0.2 address, presumably by the NTL Modem. Have I got this correct - the 2020 modem contains a DHCP server?
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The facts you present suggest that you have two levels of NAT routing taking place: one inside the 2020 (which appears to be a combined cable modem and router, so that businesses can attach multiple PCs), and one in the Netgear.
Double NAT layers are usually a bad idea, so you would do well to:
- either disable NAT on the 2020 and take a single public IP address from it (I have no idea whether this is possible);
- or dispense with the Netgear router, and plug everything into the NTL 2020 with the help of a switch.
If you stick with double-NAT, then any port-forward arrangements have to be duplicated in both the 2020 and the Netgear: the 2020 must port-forward to the Netgear, and the Netgear must port-forward to the PC.