Cisco Cisco Wireless LAN Controller Module Guía Para Resolver Problemas

Contents

Introduction

External DHCP Server

Comparison of DHCP Proxy and Bridging Modes

DHCP Proxy Mode

Proxy Packet flow

Proxy Packet Capture

Proxy Configuration Example

Troubleshoot

Caveats

DHCP Bridging Mode

DHCP Bridging Operations - Bridging Packet Flow

Bridging Packet Capture - Client Perspective

Bridging Packet Capture - Server Perspective

Bridging Configuration Example

Troubleshoot

Caveats

Internal DHCP Server

Comparison of Internal DHCP and Bridging Modes

Internal DHCP Server - Packet flow

Internal DHCP Server Configuration Example

Troubleshoot

Clear the DHCP Leases on the WLC's Internal DHCP Server

Caveats

End User Interface

DHCP Required

L2 and L3 Roaming

Related Information

Introduction

This document describes the different DHCP operations on the wireless controller, which provide
consistent and accurate information to administrators who look to troubleshoot their network.

External DHCP Server

The Wireless LAN Controller (WLC) supports two modes of DHCP operations in case an external
DHCP server is used:

DHCP proxy mode

●

DHCP bridging mode

●

DHCP proxy mode serves as a DHCP helper function in order to achieve better security and
control over DHCP transactions between the DHCP server and the wireless clients. DHCP