Cisco Systems OL-16647-01 Edit DHCP Server

13-6
Cisco ASDM User Guide
OL-16647-01
Chapter 13 DHCP, DNS and WCCP Services
DHCP Server
Edit DHCP Server
You can enable DHCP and specify the DHCP address pool for the selected interface in the Edit DHCP
Server dialog box.
Fields
• Enable DHCP Server—Check this check box to enable the DHCP server on the selected interface.
Uncheck this check box to disable DHCP on the selected interface. Disabling the DHCP server on
the selected interface does not clear the specified DHCP address pool.
• DHCP Address Pool—Enter the IP address pool used by the DHCP server. Enter the range of IP
addresses from lowest to highest. The range of IP addresses must be on the same subnet as the
selected interface and cannot contain the IP address of the interface itself.
• Optional Parameters—You can optionally configure the following parameters for the DHCP server:
– DNS Server 1—Enter the IP address of the primary DNS server for a DHCP client.
– DNS Server 2— Enter the IP address of the alternate DNS server for a DHCP client.
– Domain Name—Enter the DNS domain name for DHCP clients. Enter a valid DNS domain
name, for example example.com.
– Lease Length—Enter the amount of time, in seconds, that the client can use its allocated IP
address before the lease expires. Valid values range from 300 to 1048575 seconds. The default
value is 3600 seconds (1 hour).
– Primary WINS Server—Enter the IP address of the primary WINS server for a DHCP client.
– Secondary WINS Server—Enter the IP address of the alternate WINS server for a DHCP client.
– Ping Timeout—Enter the amount of time, in milliseconds, that the security appliance waits to
time out a DHCP ping attempt. Valid values range from 10 to 10000 milliseconds. The default
value is 50 milliseconds.
– Enable Auto-configuration on interface—Check this check box to enable DHCP
auto-configuration and select the interface from the menu.
– Advanced—Opens the Advanced DHCP Options dialog box, where you can specify DHCP
options and their parameters.
• Dynamic DNS Settings for DHCP Server—In this area, you can configure the DDNS update settings
for the DHCP server.
– Update DNS Clients—Check this check box to specify that, besides the default action of
updating the client PTR resource records, the DHCP server should also perform the following
update actions (if selected):
– Update Both Records—Check this check box to specify that the DHCP server should update
both the A and PTR RRs.
– Override Client Settings—Check this check box to specify that DHCP server actions should
override any update actions requested by the DHCP client.
Modes
The following table shows the modes in which this feature is available: