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How to Configure DHCP on a Cisco ASA 5505?

January 4 2012 , Written by Cisco & Cisco Router, Network Switch Published on #Cisco Switches - Cisco Firewall

Dynamic Host Configuration Protocol (DHCP) is a network application protocol used by devices (DHCP clients) to obtain configuration information for operation in an Internet Protocol network. This protocol reduces system administration workload, allowing devices to be added to the network with little or no manual intervention.



The diagram has the network topology. In this network the firewall is the gateway of the network. Firewall and Servers will be excluded from the DHCP pool.

First step is to configure the inside (LAN) interface on the network

FIREWALL(config)#interface Vlan1
FIREWALL(config-if)#nameif inside
FIREWALL(config-if)#security-level 100
FIREWALL(config-if)#ip address

Next assign the LAN ports for the correct VLAN in this case port 1 of firewall will be on VLAN 1

FIREWALL(config)#interface Ethernet0/1
FIREWALL(config-if)#switchport access vlan 1
FIREWALL(config-if)#no shut

Lastly, configure the dhcp range and assign it to an interface. Configure DNS servers, one internal and one external in case the internal fails. Enable DHCP on the inside interface

FIREWALL(config)#dhcpd address inside
FIREWALL(config)#dhcpd dns
FIREWALL(config)#dhcpd enable inside

In order to see which devices are receiving DHCP from the firewall run the following command

FIREWALL(config)#sh dhcpd binding

IP address Hardware address Lease expiration Type


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