When you want to connect to your DVR remotely, you will need to use either the internal or the external IP address. This will be determined by whether you are accessing the DVR from inside the network or from outside the network. If you are accessing the DVR from inside your network then you will use the internal IP address. The internal IP address will usually begin with 192.168.XX.XXX . No port number would be used since you are connecting internally. The internal IP address can usually be found in your DVR under network settings.
To access your DVR from outside the network, you will need to use an external IP address followed by the port number to identify the DVR (unless you put the DVR on port 80). An external IP address is the IP address used to connect to your router. The port number will identify the individual device inside the network you wish to access. So an external IP address would not have 192.168 in the beginning but it could be anything else. An external IP address would be entered as XXX.XXX.XXX.XXX:port#