ZyXEL Communications 70 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 5 LAN Screens

110

This chapter describes how to configure LAN settings. This chapter is only applicable when 
the ZyWALL is in router mode. The LAN Port Roles screen is available on the ZyWALL 5 
and ZyWALL 35.

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.  

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. 

The ZyWALL 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.

The ZyWALL has built-in DHCP server capability that assigns IP addresses and DNS servers 
to systems that support DHCP client capability.

The LAN parameters of the ZyWALL are preset in the factory with the following values:

• IP address of 192.168.1.1 with subnet mask of 255.255.255.0 (24 bits)
• DHCP server enabled with 128 client IP addresses starting from 192.168.1.33.