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DIAGRAM 6‐2 DNS
The computer will analyses the domain name configurated in DVR, and return to the current IP, as the
picture shows underlined in red. When the IP correspond to the embedded DVR’s IP in Public internet,
it means the DDNS is setting right. If they are not, please check the network connection of embedded
DVR and DDNS information.
6.2.
PORT MAPPING
Port mapping is mapping a port of outside web host’s IP address to a machine inside web, and provide
the service. When user connects to the port of the IP, the server will automatically map the request to
the corresponding machine inside LAN.
With the function of port mapping, we can map many ports of a machine’s IP address to different
machines’ different ports inside web. The port mapping can also have other special agent 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 ways to map the port: UPnP function automatically map and modify the router’s port
mapping chart by manual.
6.2.1.
UPNP FUNCTION
