EverFocus EMV1200 FHD User Manual page 106

DNS Address (depending on your network hardware and IP 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 mobile DVR to communicate with the DDNS server.
c. You can obtain the actual DNS IP from your Internet Service Provider (ISP); or, from a
PC located on the same LAN as the mobile DVR, 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 mobile DVR. 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 mobile DVR 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 mobile DVR 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 mobile DVR, 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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