Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 46)

1-20

Cisco PIX Firewall and VPN Configuration Guide

78-15033-01

Chapter 1 Getting Started

Accessing and Monitoring PIX Firewall

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.

When functioning as a DHCP server, the PIX Firewall dynamically assigns IP addresses to DHCP clients

from a pool of designated IP addresses.

PIX Firewall Version 6.2 or higher supports DHCP option 66 and DHCP option 150 requests. This lets

DHCP clients, such as Cisco IP Phones, obtain the address of a designated TFTP server. Cisco IP Phones

typically obtain the configuration information required to connect to a Cisco CallManager server from

a TFTP server. A DHCP option 66 request causes the DHCP server to provide the address of a single

TFTP server; an option 150 request obtains a list of TFTP servers.

PIX Firewall Version 6.3 or higher allows the use of the DHCP server on any interface. Previous versions

only allowed the use of the DHCP server on the inside interface.

DHCP Relay

PIX Firewall Version 6.3 provides support for DHCP relay. The DHCP relay agent provided helps

dynamically assign IP addresses to hosts on the inside interfaces of the PIX

Firewall. When the DHCP

relay agent receives a request from a host on an inside interface, it forwards the request to one of the

specified DHCP servers on an outside interface.

DHCP Client

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.

Note 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.

Accessing and Monitoring PIX Firewall

This section describes how you access and monitor the PIX Firewall system. It contains the following

topics:

• Connecting to the Inside Interface of a Remote PIX Firewall, page 1-21

• Cisco PIX Device Manager (PDM), page 1-21

• Command Authorization, page 1-21

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 465 466

Keine Kommentare

Cisco PIX 525 Spezifikationen Seite 46