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ENVR8304D-8CH
Appendix
A
Appendix A: Network Overview
This chapter will give you a basic instruction on how to set up the NVR for network connection.
It is highly recommended that you have a working knowledge of what a network is and how it
works. This will be helpful in completing the networking process.
Introduction to TCP / IP
TCP/IP is the group of protocols used by the Internet and most Local Area Networks (LANs)
throughout the world. In TCP/IP, every computer or other communications device that is
connected to the network has a unique IP address. By doing this you are giving your device a
unique address similar to the address of your house. An IP address is composed of four octets
(numbers in the range of 0 to 255) separated by decimal points. The IP address is used to
uniquely identify a host or computer on the LAN. For example, one computer on a network
could have an IP address of 192.168.1.127.
You should never give two or more devices the same exact IP address, but the first three octets
of an IP address is often the same for all computers in the local area network. For example, if a
total of 253 computers exist in a single LAN, the IP addresses could be assigned starting with
192.168.1.x, where x represents a number in the range of 2 to 254. In IPP address could be
compared with a telephone number.
Subnet Masks
Each host in a LAN has a subnet mask. The subnet mask is a set of octets that is used to
determine which LAN or class it belongs to. The number 255 is usually used to represent the
network address portion of the IP address and a zero is placed at the end to identify the host
portion of the address. Basically the subnet mask tells the devices how the network addresses
are organized, and helps to determine which addresses are local and which are remote (on the
other side of the router).
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