Chapter 4 Wan, Lan And Server Setup; Factory Ethernet Defaults; Lans And Wans; Ip Address Assignment - ZyXEL Communications ZYAIR G-4100 User Manual

This chapter shows you how to configure LAN and WAN ports and server settings.
4.1

Factory Ethernet Defaults

The Ethernet parameters of the ZyAIR are preset to the following values:
•
Dynamic WAN IP address.
•
LAN IP address of 192.168.1.1 with subnet mask of 255.255.255.0
•
DHCP server enabled on the LAN with a 253 client IP address pool starting from
192.168.1.2.
These parameters should work for the majority of installations. If you wish to change the factory
defaults or to learn more about TCP/IP, please read on.
4.2

LANs and WANs

A LAN (Local Area Network) is a computer network limited to the immediate area, usually the same
building or floor of a building. A WAN (Wide Area Network), on the other hand, is an outside
connection to another network or the Internet.
4.3

IP Address Assignment

A static IP is a fixed IP that the ZyAIR obtains from a DHCP server on a network. A dynamic IP is not
fixed; the DHCP server provides an IP address to the ZyAIR each time it connects to the network.
When an Ethernet device is configured to obtain a dynamic IP address from a DHCP server, it is
known as a DHCP client.
4.4

DHCP Configuration

DHCP (Dynamic Host Configuration Protocol) allows the individual clients (Ethernet device) to
obtain the TCP/IP configuration at start-up from a centralized DHCP server. The ZyAIR has built-in
DHCP server capability, which means it can assign IP addresses, an IP default gateway and DNS
servers to computer systems that support the DHCP client when this feature is activated. The ZyAIR
can also act as a surrogate DHCP server where it relays IP address assignment from the actual DHCP
server to the clients.

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); please do not use any other number unless you are told otherwise. Let's
WAN, LAN and Server Setup
WAN, LAN and Server Setup
ZyAIR G-4100 User's Guide
Chapter 4
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