Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario descargar pdf (Pagina 35)

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Cisco Wireless LAN Solution Product Guide

OL-7955-01

Chapter 1 Overview

External DHCP Servers

The operating system is designed to appear as a DHCP Relay to the network and as a DHCP Server to

clients with industry-standard external DHCP Servers that support DHCP Relay. This means that each

Cisco Wireless LAN Controller appears as a DHCP Relay agent to the DHCP Server. This also means

that the Cisco Wireless LAN Controller appears as a DHCP Server at the virtual IP Address to wireless

clients.

Because the Cisco Wireless LAN Controller captures the client IP Address obtained from a DHCP

Server, it maintains the same IP Address for that client during same-Cisco Wireless LAN Controller,

inter-Cisco Wireless LAN Controller, and inter-subnet client roaming.

Per-Wireless LAN Assignment

All Cisco WLAN Solution wireless LANs can be configured to use the same or different DHCP Servers,

or no DHCP Server. This allows operators considerable flexibility in configuring their Wireless LANs,

as further described in the “Cisco WLAN Solution Wireless LANs” section on page 1-14.

Note that Cisco WLAN Solution wireless LANs that support management over wireless must allow the

management (device servicing) clients to obtain an IP Address from a DHCP Server. See the “Using

Management over Wireless” section on page 3-14 for instructions on configuring management over

wireless.

Per-Interface Assignment

You can assign DHCP servers for individual interfaces.

• The Layer 2 management interface can be configured for a primary and secondary DHCP server. See

the “About the Management Interface” section on page 1-22 for more information on the

management interface.

• The Layer 3 AP-Manager interface can be configured for a primary and secondary DHCP server.

See the “AP-Manager Interface” section on page 1-23 for more information on the AP-Manager

interface.

• Each of the operator-defined interfaces can be configured for a primary and secondary DHCP server.

See the “Operator-Defined Interfaces” section on page 1-24 for more information on

operator-defined interfaces.

• The virtual interface does not use DHCP servers. See the “Virtual Interface” section on page 1-24

for more information on virtual interfaces.

• The service-port interface can be configured to enable or disable DHCP servers. See the “Service

Port” section on page 1-25 for more information on service-port interfaces.

Security Considerations

For enhanced security, it is recommended that operators require all clients to obtain their IP Addresses

from a DHCP server. To enforce this requirement, all wireless LANs can be configured with a DHCP

Required setting and a valid DHCP Server IP Address, which disallows client static IP Addresses. If a

client associating with a wireless LAN with DHCP Required set does not obtain its IP Address from the

designated DHCP Server, it is not allowed access to any network services.

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Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario Pagina 35