Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 57)

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Cisco PIX Firewall and VPN Configuration Guide

78-15033-01

Chapter 1 Getting Started

Before You Start Configuring PIX Firewall

Note The factory default setting for the DHCP address pool size is determined by your PIX Firewall platform

and your feature license. For information about the possible options, refer to “

Using the PIX Firewall

DHCP Client” in Chapter 4, “Using PIX Firewall in SOHO Networks.”

Clearing and Removing Configuration Settings

To clear all the configuration for a specified command and all its subcommands, enter the following

command:

clear configurationcommand [subconfigurationcommand]

This command clears all the current configuration for the specified configuration command. If you only

want to clear the configuration for a specific subcommand, you can enter a value for

subconfigurationcommand.

To disable the specific parameters or options of a command or subcommand, enter the no form of the

command, as follows:

no configurationcommand [subconfigurationcommand] qualifier [...]

In this case, you use the no command to remove the specific configuration identified by qualifier.

Before You Start Configuring PIX Firewall

The key to successful implementation of your PIX Firewall is having a clear security policy that

describes how to control access and use of your organization’s network resources. You need to

understand your security policy to ensure that you implement and configure the PIX

Firewall in a way

that supports this policy. Your security policy should have the support of the various departments and

administrators responsible for its implementation and should be well understood by network users.

Before you configure the PIX Firewall, sketch out a network diagram with IP addresses that you will

assign to the PIX

Firewall and those of routers on each interface. If you have more than two interfaces

in the PIX

Firewall, note the security level for each interface.

Where to Go from Here

• To complete the configuration required to connect your PIX Firewall to your existing network, refer

Chapter 2, “Establishing Connectivity.”

• To allow or restrict specific types of network activity and access, refer to Chapter 3, “Controlling

Network Access and Use.”

• To use the application inspection and the fixup command to control the secure use of specific

applications and services, refer to

Chapter 5, “Configuring Application Inspection (Fixup).”

• To use a PIX Firewall as an Easy VPN Remote device in relation to an Easy VPN Server or to use

it with DHCP or PPPoE, refer to

Chapter 4, “Using PIX Firewall in SOHO Networks.”

• To perform basic VPN configuration, refer to Chapter 6, “Configuring IPSec and Certification

Authorities.”

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