Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 174)

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Cisco PIX Firewall and VPN Configuration Guide

78-15033-01

Chapter 4 Using PIX Firewall in SOHO Networks

Using the PIX Firewall DHCP Client

Replace seconds with the number of seconds allowed for relay address negotiation.

You can use the following commands to display debugging information for the DHCP Relay Agent:

Debug dhcprelay event

Debug dhcprelay error

Debug dhcprelay packet

Using the PIX Firewall DHCP Client

This section describes how to enable and manage the DHCP client on a PIX Firewall. It includes the

following topics:

• Overview, page 4-22

• Configuring the DHCP Client, page 4-22

• Releasing and Renewing the DHCP Lease, page 4-23

• Monitoring and Debugging the DHCP Client, page 4-23

Overview

DHCP client support within the PIX Firewall is designed for use within a small office, home office

(SOHO) environment using a PIX

Firewall that is directly connected to a DSL or cable modem that

supports the DHCP server function.

Note The PIX Firewall DHCP client can only be enabled on the outside interface.

With the DHCP client feature enabled on a PIX Firewall, the PIX Firewall functions as a DHCP client

to a DHCP server allowing the server to configure the outside interface with an IP address, subnet mask,

and optionally a default route. Use of the DHCP client feature to acquire an IP address from a generic

DHCP server is not supported. Also, the PIX

Firewall DHCP client does not support failover

configurations.

The DHCP-acquired IP address on the outside interface can also be used as the PAT global address. This

makes it unnecessary for the ISP to assign a static IP address to the PIX

Firewall. Use the global

command with the interface keyword to enable PAT to use the DHCP-acquired IP address of outside

interface. For more information about the global command, see the global command page in the

Cisco

PIX Firewall Command Reference.

Configuring the DHCP Client

To enable the DHCP client feature on a given PIX Firewall interface and set the default route via the

DHCP server, enter the following command:

ip address outside dhcp [setroute] [retry retry_cnt]

The ip address dhcp command enables the DHCP client feature on the outside PIX Firewall interface.

The optional setroute argument tells the PIX

Firewall to set the default route using the default gateway

parameter the DHCP server returns. If the setroute argument is configured, the show route command

displays the default route set by the DHCP server.

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