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configuration this may be the IP address of your router/gateway, or it may be the
actual IP address of the local DNS server). The DNS server IP is required because
your DNS server provides critical information necessary for the NVR to
communicate with the DDNS server.
You can obtain the actual DNS IP from your Internet Service Provider (ISP); or, from a PC
located on the same LAN as the NVR, go to http://www.dnsserverlist.org/ to obtain a list of
the IP addresses of their recommendation of the best servers to use for your location.
2. If you are connecting through a router, make sure that you have 'opened up' all the
required network ports in the port forwarding section of your router's setup options.
That is, you have directed the router to send any incoming traffic using those IP ports
to the LAN IP address of the NVR. Useful information about router port forwarding can
be found at www.portforward.com . Different routers may use different terms for port
forwarding function. For instance, D-Link calls it virtual server, Netopia calls it pinholes.
The default port for the NVR is: 80
Note: Port 80 is the default port used for Web browsing. Because of this, in order to
prevent the average user from hosting a Web server, most ISPs BLOCK traffic using port
80 from reaching the average site. If you only plan to view your NVR on a LAN, you can
use port 80, and don't have to concern yourself with DDNS or routers. However, if you
desire remote access to your NVR, perhaps using DDNS (optional), you MUST select
functional ports and set up the port forwarding in your router. Other ports, such as
8080 and 8000 are sometimes blocked by ISPs as well.
What port(s) should be used? There are 65,535 valid IP ports to choose from. These are
broken down into three groups:
•
Well Known Ports 0 thru 1023
•
Registered Ports 1024 thru 49151
•
Dynamic and/or Private Ports 49152 thru 65535
So, rather than encounter a port conflict by choosing a port commonly used for
another purpose (like port 25 for SMTP mail or port 448 for secure sockets), choose an
'unusual' port number. For example, add 50,000 to your house number: 50,123 is less
likely to lead to a port conflict. For a list of the known and registered ports, see
http://www.iana.org/assignments/port-numbers
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ENVR8304D-8CH
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