Cisco Pix DHCP Relay Usage

This article would show you how to use DHCP Relay Usage using a Cisco Pix Firewall.

Scenario: You are adding a new DHCP server and would like it permitted as a DHCP relay through the firewall. The address is 192.168.2.1.

Setup the IP address of the DHCP server to which the DHCP relay agent forwards client requests.

dhcprelay server 192.168.2.10 inside

Setup dhcprelay for the name of the interface on which the DHCP relay agent accepts client requests.

dhcprelay enable inside2
dhcprelay enable inside3
dhcprelay enable inside4
dhcprelay enable intf5

Set the dhcp relay timeout:

dhcprelay timeout 60

Commands to verify:

show dhcprelay
show dhcprelay statistics

Example:

pixfw(config)# dhcprelay server 10.1.1.1 outside

pixfw(config)# show dhcprelay
dhcprelay server 10.1.1.1 outside
dhcprelay timeout 50

pixfw(config)# dhcprelay timeout 60

pixfw(config)# show dhcprelay
dhcprelay server 10.1.1.1 outside
dhcprelay timeout 60

pixfw(config)# dhcprelay enable inside

pixfw(config)# show dhcprelay
dhcprelay server 10.1.1.1 outside
dhcprelay enable inside
dhcprelay timeout 60