EverFocus EDR 1600, Instruction Manual

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Gateway Address 

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.  

 
Virtual Ports 

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:  

http://www.everfocus.com:8100/  

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. 

Please 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.