DHCP SERVICES In Cisco ASA
The appliances support many DHCP services, including being a DHCP server and/or
client as well as relaying DHCP client requests for addressing information on one interface
to a second interface that has a DHCP server connected to it. This is similar to the
IOS IP Helper feature.
ciscoasa(config)# dhcpd address IP_address-IP_address logical_if_name
ciscoasa(config)# dhcpd domain domain_name
ciscoasa(config)# dhcpd dns dns_IP_1 [dns_IP_2]
ciscoasa(config)# dhcpd wins wins_IP_1 [wins_IP_2]
ciscoasa(config)# dhcpd lease lease_length
ciscoasa(config)# dhcpd ping_timeout milliseconds
ciscoasa(config)# dhcpd option option_number ip IP_address
ciscoasa(config)# dhcpd auto_config logical_if_name [[vpnclient-wins-override]
interface logical_if_name]
ciscoasa(config)# dhcpd enable logical_if_name
DHCP Server Verification :-
client as well as relaying DHCP client requests for addressing information on one interface
to a second interface that has a DHCP server connected to it. This is similar to the
IOS IP Helper feature.
DHCP Server Configuration :-
The following commands are used to configure the appliance as a DHCP server:ciscoasa(config)# dhcpd address IP_address-IP_address logical_if_name
ciscoasa(config)# dhcpd domain domain_name
ciscoasa(config)# dhcpd dns dns_IP_1 [dns_IP_2]
ciscoasa(config)# dhcpd wins wins_IP_1 [wins_IP_2]
ciscoasa(config)# dhcpd lease lease_length
ciscoasa(config)# dhcpd ping_timeout milliseconds
ciscoasa(config)# dhcpd option option_number ip IP_address
ciscoasa(config)# dhcpd auto_config logical_if_name [[vpnclient-wins-override]
interface logical_if_name]
ciscoasa(config)# dhcpd enable logical_if_name
The show dhcpd command displays the address bindings and statistics for the DHCP
server:
ciscoasa# show dhcpd {binding [IP_address] | state | statistics}
Here’s an example of the use of this command, which displays the IP addresses assigned
to requesting users:
ciscoasa# show dhcpd binding
IP Address Hardware Address Lease Expiration Type
10.0.1.101 0100.a0d4.e834 84985 seconds automatic
In this example, only one address has been assigned to a client.
default gateway (10.0.1.1) for the inside interface:
ciscoasa(config)# dhcpd address 10.0.1.200-10.0.1.254 inside
ciscoasa(config)# dhcpd domain dealgroup.com
ciscoasa(config)# dhcpd dns 4.2.2.2
ciscoasa(config)# dhcpd ping_timeout 500
ciscoasa(config)# dhcpd option 3 ip 10.0.1.1
ciscoasa(config)# dhcpd enable inside
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