Chapter 4 Lan Screens; Lan Overview; Dhcp Setup; Lan Tcp/Ip - ZyXEL Communications ZyWALL 5 User Manual

This chapter describes how to configure LAN settings. This chapter is only applicable when
4.1

LAN Overview

Local Area Network (LAN) is a shared communication system to which many computers are attached.
The LAN screens can help you configure a LAN DHCP server, manage IP addresses, and partition
your physical network into logical networks.
4.2

DHCP Setup

DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to
obtain TCP/IP configuration at start-up from a server. You can configure the ZyWALL as a DHCP
server or disable it. When configured as a server, the ZyWALL provides the TCP/IP configuration for
the clients. If DHCP service is disabled, you must have another DHCP server on your LAN, or else the
computer must be manually configured.
4.2.1 IP Pool Setup
The ZyWALL is pre-configured with a pool of 128 IP addresses starting from 192.168.1.33 to
192.168.1.160. This configuration leaves 127 IP addresses (excluding the ZyWALL itself) in the
lower range for other server computers, for instance, servers for mail, FTP, TFTP, web, etc., that you
may have.
4.2.2 DNS Servers
Use the LAN screen to configure the DNS server information that the ZyWALL sends to the DHCP
client devices on the LAN.
There are three places where you can configure DNS setup on the ZyWALL.
1. Use the MAINTENANCE General screen to configure the ZyWALL to use a DNS server to
resolve domain names for ZyWALL system features like VPN, DDNS and the time server.
2. Use the LAN screen to configure the DNS server information that the ZyWALL sends to the
DHCP client devices on the LAN.
3. Use the REMOTE MGMT DNS screen to configure the ZyWALL to accept or discard DNS
queries.
4.3

LAN TCP/IP

The ZyWALL has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
4.3.1 Factory LAN Defaults
The LAN parameters of the ZyWALL are preset in the factory with the following values:
LAN Screens
ZyWALL 5 Internet Security Appliance
Chapter 4
LAN Screens
the ZyWALL is in router mode.
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