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6.
Enter the each field.
i.
Application: Enter a description of the DVR (Example: store1)
ii.
Start: Enter the first number of the port you need to port forward (Example: 5445)
iii.
End: Enter the last number of the port you need to port forward (Example: 5445)
iv.
Protocol: Select Both.
v.
IP address: Enter the IP address of the DVR on SETUP>NETWORK>LAN>IP ADDRESS.
vi.
Enable: Check the enable box.
7.
Select the Save settings button located on the bottom of the window. Then Port forwarding is finished.
The site below shows steps for port forwarding for specific router models.
http://www.portforward.com/english/routers/port_forwarding/routerindex.htm