|This was a type wasn't it with the .0?|
"It is now. http://192.168.1.201, but when i try and put it on http://192.168.0.201 it wont work."
1st step with the dvr at 192.168.1.201 it should be accessable via the lan by typing that ip into IE. Are you successful getting to the dvr this way?
Next step is determining what the routers wan interface ip address is. You keep giving me your modem's ip but you don't forward from the modem. You forward from the router.
I would suggest you go into your router, browse to the wan interface or go to status and note the wan interfaces ip address.
It is this address, not the modems, that you put into IE OUTSIDE the lan ie. via another internet access.
You are right that you should not be able to put in the modems ip address and then gain access to the lan based dvr. This should not work simply because the request should hit the modems lan interface and be dropped not reflected back to the lan.
Your topology should be like this:
cable modem [86.xx.xxx.173] lan interface<>Netgear wan interface [???.???.???.???] <>netgear lan interface [192.168.1.1]<> DVR [192.168.1.201]
subnet mask on the xxx.xxx.1.x network would be 255.255.255.0