IronPort Systems ZyAIR B-4000 - Manual (Page 49)

ZyAIR B-4000 Hot Spot Gateway
WAN, LAN and Server Setup 4-1
Chapter 4
WAN, LAN and Server Setup
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.