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In this example, the number 8100 refers to the port number used by the browser to connect to the web server. The standard
port number used by web sites is 80, so this number does not need to be included with the URL (although it can be). In IP
networking, port numbers can theoretically range from 0 to 65535. Most popular network applications, though, use port
numbers at the lower end of the range (such as 80 for HTTP). Ports are similar to doors and windows of your house, with
port 80 acting as the front door. If these are not open you could not enter the house. This is the same case with ports on a
network. If the ports for a specific IP address are not open then you could not gain access to that IP address.
Note: The term port also refers to several other aspects of network technology. A port can refer to Ethernet
connection points, such as those on a hub, switch, or router. The term port is also used to refer to a physical
connection point for peripheral devices such as serial, parallel, and USB ports.
Another analogy would be: if a WAN IP address is similar to the phone number identify a site, IP ports are similar to
telephone extensions, in that they allow communication with specific devices within a site that all share the same external
(WAN) IP address. A router is a device which allows multiple computers and other IP enabled equipment to share that
single WAN IP address. It functions like a "switchboard operator" – opening ports creates an association between those port
numbers and the LAN IP address of specific equipment on the LAN behind the router. When the router sees a 'call' for a
specific 'extension' (port), it directs that data stream to the (LAN IP address of the) equipment associated with that
'extension' (port).
6.5 PRE-INSTALLATION
Before beginning the installation, please answer the following questions:
Do you have Hi-speed Internet?
There are many types of high speed Internet available. The most common ones are T1, Cable, and DSL (in order of
speed). The DVR is not compatible with a dial-up connection.
Note: EverFocus suggests having a minimum upload speed of 256KBps. This can be addressed by your
Internet Service Provider.
What type of modem/router do you have?
The modem/router was either installed by your Internet service provider or purchased by you to establish a
connection to the Internet. A router assigns different internal IP addresses to local computers; this allows multiple
computers to access the Internet through the same external IP address.
Do you have a static IP address?
A Static IP address means you use the same IP address every time you connect to the Internet. With a static IP
address, other Internet users always know the address of your location and can easily connect with it. This makes it
much simpler to host a website, email server, or other type of server connection. Everfocus suggests using a static
IP address. If this is not available, you will need to use a dynamic IP address. This is explained below.
Do you have a dynamic IP address?
A Dynamic IP address means your IP address changes each time you connect to the Internet. We recommend
asking your Internet service provider for a Static IP address. If this is not a possibility, you may use the DDNS
feature of the DVR. DDNS stands for Dynamic Domain Name Server, a service that provides a central database
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Modem/router model name/ #
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