Our CCTV recorder box outputs on and I want to send the pictures to an ip address, call it 2xx.2xx.3xx.1xx, using the above router This has been working in the past but has stopped working, because ( I think) the internal address changed from to - 4. (Somebody else set it up) Now I can't get it to work. Every time I go to IP forwarding and type in the relevant addresses it fails because I put in the wrong netmask. I've tried leaving it blank and putting and with no joyfulness. Could somebody explain to me where I am going wrong?