ZyXEL Communications Corporation AMG1302 Manuel D’Utilisation

Chapter 7 LAN Setup

AMG1302-T10A User’s Guide

The Device is pre-configured with a pool of IP addresses for the DHCP clients (DHCP Pool). See the 

product specifications in the appendices. Do not assign static IP addresses from the DHCP pool to 

your LAN computers.

DNS (Domain Name System) maps 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. The DNS server addresses you enter when you set up DHCP are 

passed to the client machines along with the assigned IP address and subnet mask.

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.

• Some ISPs choose to disseminate the DNS server addresses using the DNS server extensions of 

IPCP (IP Control Protocol) after the connection is up. If your ISP did not give you explicit DNS 

servers, chances are the DNS servers are conveyed through IPCP negotiation. The Device 

supports the IPCP DNS server extensions through the DNS proxy feature.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It 

does not mean you can leave the DNS servers out of the DHCP setup under all circumstances. If 

your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the 

screen.

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

systems that support DHCP client capability.

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 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.