ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 59)

Chapter 4 Connection Wizard

NBG420N User’s Guide

You can obtain your IP address from the IANA, from an ISP or have it assigned by 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. 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.

4.4.6 IP Address and Subnet Mask

Similar to the way houses on a street share a common street name, so too do 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.

If the ISP did not explicitly give you an IP network number, then most likely you have a single

user account and the ISP will assign you a dynamic IP address when the connection is

established. The Internet Assigned Number Authority (IANA) reserved this block of addresses

specifically for private use; 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.

Once you have decided on the network number, pick an IP address that is easy to remember,

for instance, 192.168.1.1, for your NBG420N, but make sure that no other device on your

network is using that IP address.

The subnet mask specifies the network number portion of an IP address. Your NBG420N will

compute the subnet mask automatically based on the IP address that you entered. You don't

need to change the subnet mask computed by the NBG420N unless you are instructed to do

otherwise.

4.4.7 DNS Server Address Assignment

Use DNS (Domain Name System) to map a domain name to its corresponding IP address and

vice versa, for instance, the IP address of www.zyxel.com is 204.217.0.2. The DNS server is

extremely important because without it, you must know the IP address of a computer before

you can access it.

The NBG420N can get the DNS server addresses in the following ways.

1 The ISP tells you the DNS server addresses, usually in the form of an information sheet,

when you sign up. If your ISP gives you DNS server addresses, enter them in the DNS

Server fields in the Wizard and/or WAN > Internet Connection screen.

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ZyXEL NBG420N Manuel d'utilisateur Page 59