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D IAGR AM 5 -2 D N S
The computer will analyze the domain name configured in the DVR, and return to the current IP
address, as the graphic shows underlined in red. When the IP address corresponds to the
embedded DVR’s IP address in Public internet, it means the DDNS is set up correctly. If they are
not the same, please check the network connection of the embedded DVR and the DDNS
information.
5.2. PORT FORWARDING
Port forwarding is the mapping of a port outside of the
web host’s IP address to a machine inside
the web, and provides service. When a user connects to the port of the IP address, the server will
automatically map the request to the corresponding machine on the LAN.
With the port mapping function, we can map many ports of one
machine’s IP address to different
machines and different ports on the web. Port mapping can also have other special functions, like
POP, SMTP, TELNET, etc. Theoretically, it can provide more than sixty thousand ports.
For example, if we want to map a web server which has an IP address of 192.168.111.10, we just
need to input the IP address and TCP port 80 into the port mapping chart of the router.
There are two methods to map a port, automatic and manual. The UPnP function automatically
maps the port and modifies th
e router’s port mapping chart.
