Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 108)

100

101

8-26

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Chapter 8 Configuring IP Routing and DHCP Services

Configuring DHCP

For example, to assign the range 10.0.1.101 to 10.0.1.110 to hosts connected to the inside interface, enter

the following commands:

hostname(config)# dhcpd address 10.0.1.101-10.0.1.110 inside

hostname(config)# dhcpd dns 209.165.201.2 209.165.202.129

hostname(config)# dhcpd wins 209.165.201.5

hostname(config)# dhcpd lease 3000

hostname(config)# dhcpd domain example.com

hostname(config)# dhcpd enable inside

Configuring DHCP Options

You can configure the security appliance to send information for the DHCP options listed in RFC 2132.

The DHCP options fall into one of three categories:

• Options that return an IP address.

• Options that return a text string.

• Options that return a hexadecimal value.

The security appliance supports all three categories of DHCP options. To configure a DHCP option, do

one of the following:

• To configure a DHCP option that returns one or two IP addresses, enter the following command:

hostname(config)# dhcpd option

code

addr_1

[

addr_2

]

• To configure a DHCP option that returns a text string, enter the following command:

hostname(config)# dhcpd option

code

ascii

text

• To configure a DHCP option that returns a hexadecimal value, enter the following command:

hostname(config)# dhcpd option

code

hex

value

Note The security appliance does not verify that the option type and value that you provide match the expected

type and value for the option code as defined in RFC 2132. For example, you can enter

dhcpd option

46 ascii hello

, and the security appliance accepts the configuration although option 46 is defined in

RFC 2132 as expecting a single-digit, hexadecimal value. For more information about the option codes

and their associated types and expected values, refer to RFC 2132.

Specific options, DHCP option 3, 66, and 150, are used to configure Cisco IP Phones. See the “Using

Cisco IP Phones with a DHCP Server” section on page 8-26 topic for more information about

configuring those options.

Using Cisco IP Phones with a DHCP Server

Enterprises with small branch offices that implement a Cisco IP Telephony Voice over IP solution

typically implement Cisco CallManager at a central office to control Cisco IP Phones at small branch

offices. This implementation allows centralized call processing, reduces the equipment required, and

eliminates the administration of additional Cisco CallManager and other servers at branch offices.

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