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5.1
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.
5.2
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 set to
None, DHCP service will be disabled and you must have another DHCP server on your LAN, or else the
computer must be manually configured.
5.2.1 IP Pool Setup
The ZyWALL is pre-configured with a pool of 32 IP addresses starting from 192.168.1.33 to 192.168.1.64.
This configuration leaves 31 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.
5.3
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 ZyWALL. 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 192.168.10 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
LAN
This chapter describes how to configure LAN settings.
ZyWALL 2 Series User's Guide
Chapter 5
LAN Screens
5-1
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