ZyXEL VSG-1200 User Manual download pdf (Page 54)

VSG-1200 User’s Guide

54 Chapter 4 LAN, WAN and Server Setup

4.4.1 IP Address and Subnet Mask

Like houses on a street that share a common street name, the computers on a LAN share one

common network number.

Where you obtain your network number depends on your particular situation. If the ISP or

your network administrator assigns you a block of registered IP addresses, follow their

instructions in selecting the IP addresses and the subnet mask.

The Internet Assigned Number Authority (IANA) reserved a block of addresses specifically

for private use (refer to Section 4.4.2 “Private IP Addresses” on page 54); please do not use

any other number unless you are told otherwise. Let’s say you select 192.168.1.0 as the

network number; which covers 254 individual addresses, from 192.168.1.1 to 192.168.1.254

(zero and 255 are reserved). In other words, the first three numbers specify the network

number while the last number identifies an individual computer on that network.

The subnet mask specifies the network number portion of an IP address.

4.4.2 Private IP Addresses

Every machine on the Internet must have a unique address. If your networks are isolated from

the Internet, for example, only between your two branch offices, you can assign any IP

addresses to the hosts without problems.

However, the Internet Assigned Numbers Authority (IANA) has reserved the following three

blocks of IP addresses specifically for private networks:

10.0.0.0 — 10.255.255.255

172.16.0.0 — 172.31.255.255

192.168.0.0 — 192.168.255.255

You can obtain your IP address from the IANA, from an ISP or it can be assigned from a

private network. If you belong to a small organization and your Internet access is through an

ISP, the ISP can provide you with the Internet addresses for your local networks. On the other

hand, if you are part of a much larger organization, you should consult your network

administrator for the appropriate IP addresses.

Regardless of your particular situation, do not create an arbitrary IP address; always follow the

guidelines above.

Note: For more information on address assignment, please refer to RFC

1597, Address Allocation for Private Internets and RFC 1466, Guidelines for

Management of IP Address Space.

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ZyXEL VSG-1200 User Manual Page 54