Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 168)

4-16

Cisco PIX Firewall and VPN Configuration Guide

78-15033-01

Chapter 4 Using PIX Firewall in SOHO Networks

Using the PIX Firewall DCHP Server

6 packets sent, 6 received, 84 bytes sent, 0 received

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Using Related Commands

Use the following vpdn command to set the PPP parameters used during the PPP session:

vpdn group group_name ppp authentication [PAP|CHAP|MSCHAP]

Use the following command to cause the DHCP server to use the WINS and DNS addresses provided by

the access concentrator as part of the PPP/IPCP negotiations:

dhcpd auto_config [client_ifx_name]

This command is only required if the service provider provides this information as described in

RFC

1877. The client_ifx_name parameter identifies the interface supported by the DHCP auto_config

option. At this time, this keyword is not required because the PPPoE client is only supported on a single

outside interface.

Using the PIX Firewall DCHP Server

This section describes how to use the DHCP server provided by the PIX Firewall. It includes the

following topics:

• Overview, page 4-16

• Configuring the DHCP Server Feature, page 4-18

• Using Cisco IP Phones with a DHCP Server, page 4-20

Overview

PIX Firewall supports Dynamic Host Configuration Protocol (DHCP) servers and DHCP clients. DHCP

is a protocol that supplies automatic configuration parameters to Internet hosts. This protocol has two

components:

• Protocol for delivering host-specific configuration parameters from a DHCP server to a host (DHCP

client)

• Mechanism for allocating network addresses to hosts

A DHCP server is simply a computer that provides configuration parameters to a DHCP client, and a

DHCP client is a computer or network device that uses DHCP to obtain network configuration

parameters.

As a DHCP server, the PIX Firewall provides network configuration parameters, including dynamically

assigned IP addresses, to DHCP clients. These configuration parameters provide a DHCP client the

networking parameters required to access an enterprise network and network services, such as DNS.

Table 4-2 lists the number of DHCP clients that can be supported concurrently by different models and

versions of the PIX Firewall.

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