If you want do port forwarding for your local server like DVR, HTTP , etc do the following steps
1.Login to Router Configuration using ip address 192.168.1.1 put user name as Admin and default password as password.
2.Then press Advanced Setup in that tag Press NAT
3.Press virtual server tab
4.Select Index as 1
5. Give some application name and all protocol
6.Give start port default http port is 80, since give start port as 80 and end port also 80 (due to we are using only one port).
7. Finally give your local ip address of DVR or HTTP server.
Thats all, now all request for port 80 will be forwarded to your local server