ZyXEL Communications P-324 User's Guide download pdf (Page 119)

P-2602HWNLI User’s Guide

Chapter 8 LAN Setup 119

8.1.4 DNS Server Address Assignment

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

vice versa. The DNS server is extremely important because without it, you must know the IP

address of a computer before you can access it.

There are two ways that an ISP disseminates the DNS server addresses.

• 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 DHCP Setup screen.

• The ZyXEL Device acts as a DNS proxy when the DNS Server field is set to DNS Relay

in the DHCP Setup screen.

8.2 LAN TCP/IP

The ZyXEL Device has built-in DHCP server capability that assigns IP addresses and DNS

servers to systems that support DHCP client capability.

8.2.1 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. If this is the case, it is recommended that you select a network number from

192.168.0.0 to 192.168.255.0 and you must enable the Network Address Translation (NAT)

feature of the ZyXEL Device. 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 ZyXEL Device, 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 ZyXEL Device

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 ZyXEL Device unless you are

instructed to do otherwise.

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ZyXEL Communications P-324 User's Guide Page 119