Сonnecting DVR to CCTV cameras via LAN (HUAWEI router)

This post is related to an earlier one titled "How to connect DVR via internet to watch CCTV

cameras from a remote place (static IP)". I've tried to follow the same setup but have met

with some difficulties.

For one thing the router I'm using is of the HUAWEI brand and it doesn't have the

"Applications & Gaming Section / Servers of the Router", or "Server/Application" fields.
The closest analog is found under the "Advanced Setup->NAT->Virtual Servers" settings.
- Under the "NAT-Virtual Servers Setup" I selected the "Server Name" as Domain Name Server
- Under the "Server IP Address" I entered the DVR static IP, and
- Under "External/Internal Port Start/End" I entered the DVR port number.

I've tried registering the DVR on the manufacturer's website using their assigned username and password, and although the host account is successfully created, I can't log onto the DVR over the LAN. It just sort of times out when I try to access the page via http://"dvr_ip_address" in Internet Explorer.

I've also tried registering it on dyndns.org with the same result.
Please help!