Port Forwarding on ZTE modem doesn't works

Question

Modem Type : ZTE ZXHN H108N

I am trying to set port-forwarding from my modem to my CCTV. My CCTV configuration is as below:

IP Address : 192.168.1.160
Subnet Mask : 255.255.255.0
Gateway : 192.168.1.254
HTTP Port : 80

My modem configuration IP Address is 192.168.1.254. I tried set the config on modem as below:

Protocol - all
Starting port - 80
End port - 80
Local IP - 192.168.1.160

Also with DMZ :

However when I browse [public_ip], it shows the modem configuration page (as image above). When I tried to change the Port, it can't access the page at all. Also already set the DDNS using DynDns, but still accessing the modem configuration page. When I tried directly access the CCTV IP, it showing. What's wrong? Thanks..

Solution

First, an advice: Turn the DMZ off before your network gets infected by an attack coming from the Internet. The modem acts as a hardware firewall, and DMZ just bypasses all the protections. For security, you should also disable access from the Internet to the router's configuration page, and change the router's default password.

If I understand right, you are trying to access the CCTV from outside your network.

First remark: You cannot access from inside your local network a device on this same network through the Internet, because the modem most probably does not support back-loops. You should do such accesses from outside the network, for example from your phone when not connected via the modem, but not from your desktop.

The manual for the ZXHN H108N describes port forwarding on page 4-11:

Select Advanced > Port Forwarding to display the PORT FORWARDING page:

Now click Add and add parameters. As I do not have your router, I cannot tell what the values are for all the parameters, but here are some hints :

• Server IP Address : 192.168.1.160
• External Port Start/End : This is the port number you use with the modem. Choose a non-standard number, for example 1234, to avoid an Internet attack targeting well-known ports.
• Internal Port Start/End : The CCTV port number (80?)

To access the CCTV page from outside your network, use a URL of the following format :

http://[public_ip]:1234/

Port 1234 will then be forwarded to the CCTV port 80.