Cisco PIX 525 Dokumentacja Pobierz pdf (Strona 110)

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Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Chapter 8 Configuring IP Routing and DHCP Services

Configuring DHCP

To enable DHCP relay, perform the following steps:

Step 1 To set the IP address of a DHCP server on a different interface from the DHCP client, enter the following

command:

hostname(config)# dhcprelay server

ip_address if_name

You can use this command up to 4 times to identify up to 4 servers.

Step 2 To enable DHCP relay on the interface connected to the clients, enter the following command:

hostname(config)# dhcprelay enable

interface

Step 3 (Optional) To set the number of seconds allowed for relay address negotiation, enter the following

command:

hostname(config)# dhcprelay timeout

seconds

Step 4 (Optional) To change the first default router address in the packet sent from the DHCP server to the

address of the security appliance interface, enter the following command:

hostname(config)# dhcprelay setroute

interface_name

This action allows the client to set its default route to point to the security appliance even if the DHCP

server specifies a different router.

If there is no default router option in the packet, the security appliance adds one containing the interface

address.

The following example enables the security appliance to forward DHCP requests from clients connected

to the inside interface to a DHCP server on the outside interface:

hostname(config)# dhcprelay server 201.168.200.4

hostname(config)# dhcprelay enable inside

hostname(config)# dhcprelay setroute inside

Configuring the DHCP Client

To configure the security appliance interface as a DHCP client, perform the following steps:

hostname(config-if)# ip address dhcp [retry

num

] [setroute]

The optional retry num argument specifies the number of times the interface will attempt to contact a

DHCP server. The default value is 4, the maximum value is 48. The setroute keyword causes the

security appliance to set the default route using the default gateway the DHCP server returns.

Note You cannot enable a DHCP server or DHCP Relay services on an interface that is configured as a DHCP

client.

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