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Each host in a LAN has a gateway. A gateway address is composed of four octets (numbers
in the range of 0 to 255) separated by decimal points. The gateway address is used to uniquely
identify a host or computer on the LAN which assigns the IP addresses to your network. For
example, a Linksys router has an IP address of 192.168.1.1. If you were using this type of router
within your LAN, then your gateway would be the IP address of the Linksys router. The reason
this would be your gateway is because the Linksys is assigning the IP addresses for your network
therefore the Linksys would be the gateway to your network. This is similar to the zip code of your
address.
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A port number represents an endpoint or "channel" for network communications. Port
numbers allow different applications on the same computer to utilize network resources without
interfering with each other. Port numbers most commonly appear in network programming,
particularly socket programming. Sometimes, though, port numbers are made visible to the casual
user. For example, some Web sites a person visits on the Internet use a URL like the following:
In this example, the number 8100 refers to the port number used by the Web browser to
connect to the Web server. Normally, a Web site uses port number 80 and this number need not 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 low end of
the range (such as 80 for HTTP). This could be similar to the front door of your house. Without the
door to the house being open you could not enter it. 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
or what it is addressing.
Note: The term port also refers to several other aspects of network technology. A port
can refer to a physical connection point for peripheral devices such as serial, parallel,
and USB ports. The term port also refers to certain Ethernet connection points, such as
those on a hub, switch, or router.
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Before we begin with the installation we must ask ourselves a few questions in order to
figure out where to begin with networking our DVR's.
Do you have Hi-speed Internet?
There are many types of high speed Internet available. Three commonly used ones are T1,
Cable, and DSL (in order of speed).
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