Static or DHCP?

Hi!

I'm looking for some help with a DVR please. It's a four channel DVR, BNC, bought about three years ago. It was installed by a professional but I cannot find a model or make on it though.

It is working well, other than I am not able to connect to it from outside my home network on my iPhone. This used to work well, but I'm not sure what happened. Perhaps it was because my ISP, British Telecome, sent a new router? I can log into the DVR on my iPhone when using my home WiFi, but not outside.

I think this has to do with my DDNS settings, which I have checked, and they are correct. If I go to the website (i-dvr.net) and enter my IP manually, it starts working again, I can access the DVR from outside the house. However this does not last long. So I suspect that my DVR is not updating my IP with the DNS.

On the DVR itself, in the Network options, there is an option to enable DHCP, Static IP, PPPoE or 3G. At the moment, Static IP is the one enabled, with the following settings:

IP: 192.168.1.99

Subnet Mask: 255.255.255.0

Gateway: 192.168.1.254

DNS: 0.0.0.0

Underneath, I have HTTP, DDNS, NTP, Mail Setup and FTP. Here I have DDNS set to enable, with the Server, Host, User and Password boxes filled correctly.

I would have thought this should do it. But the DVR is still not updating the IP.

My question is, is it definitely Static IP that needs the enable tick? Or DHCP? Because if I enable DHCP, then Static IP becomes automatically disabled (logical). But then I am unable to access the DVR either from within my home or outside.

Quite bizarre, can't work it out! Could the DVR be fine, and could it be a setting on the modem/router provided by BT? Please help!

Thank you so much!

Austin.

if u want to view from ur phone or i[pda. use external/public ip address. 192.168.0.1 etc is ur internal. its a port forward issue and very simple. u need to log into ur router and port forward using the internal address and ports. on ur phone, use the external address. goto plug ur laptop into ur router and goto what is my ip address, hard to ex[plain, just know the difference

Thank you alanduy1 very much for taking the time to reply to me. I suspect you are right, it must be something to do with the new router BT have supplied me with. It's a BT Home Hub 5. Not sure yet how to activate Port Forwarding, but I will try and find a manual online and work from there!

Thanks again for your reply!

Austin.