How to forward a port for a DVR with a static address of a 3G modem connected to a router?

Question

network hardware

the essence of the problem is a modem from mts huawei with a static address when connected to a computer directly, the necessary ports are available when it connects to the Internet through a tp link router with a modem connected to it (the computer is connected to the router via a cord, the address 192.168.0.100 gives out) not a single port does not open at least as forward. In the status of the router settings, the modem gives the address to the router for connection 192.168.8.100, that is, as I understand it, it gave it its ip and the router already has its ip to the computer, they are all internal, and the modem itself already receives static. And the question is how to open and forward the ports you need?

Answer 1

the modem works in router mode , then tplink works in router mode, respectively, it is necessary to forward both here and there, the web address of the modem's muzzle is 192.168.8.1 and make a pass.
Or install alternative software on the modem in which it behaves like a modem, but it’s not a fact that everything will take off without finishing the tlink.
And Chinese DVRs chew 3g modems without much finishing.

Answer 2

do not tell me the instructions or where to read to do this? on the web face of the 3G modem there is native firmware and there are no additional settings such as forwarding and so on.

Answer 3

Doesn't it bother you that when connecting via a modem, he gets a gray ip?