Cisco ASA 5505 User Manual
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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 12 Configuring Dynamic DNS
Configuration Examples for DDNS
Step 1
To configure the DHCP client to request that the DHCP server perform no updates, enter the following
command:
hostname(config)# dhcp-client update dns server none
Step 2
To create a DDNS update method named ddns-2 on the DHCP client that requests that the client perform
both A and PTR updates, enter the following commands:
hostname(config)# ddns update method ddns-2
hostname(DDNS-update-method)# ddns both
Step 3
To associate the method named ddns-2 with the ASA interface named Ethernet0, and enable DHCP on
the interface, enter the following commands:
hostname(DDNS-update-method)# interface Ethernet0
hostname(if-config)# ddns update ddns-2
hostname(if-config)# ddns update hostname asa.example.com
hostname(if-config)# ip address dhcp
Step 4
To configure the DHCP server, enter the following command:
hostname(if-config)# dhcpd update dns
Example 3: Client Includes FQDN Option Instructing Server Not to Update Either
RR; Server Overrides Client and Updates Both RRs.
The following example shows how to configure the DHCP client to include the FQDN option that
instruct the DHCP server not to honor either the A or PTR updates. The example also shows how to
configure the server to override the client request. As a result, the client does not perform any updates.
To configure this scenario, perform the following steps:
Step 1
To configure the update method named ddns-2 to request that it make both A and PTR RR updates, enter
the following commands:
hostname(config)# ddns update method ddns-2
hostname(DDNS-update-method)# ddns both
Step 2
To assign the DDNS update method named ddns-2 on interface Ethernet0 and provide the client
hostname (asa), enter the following commands:
hostname(DDNS-update-method)# interface Ethernet0
hostname(if-config)# ddns update ddns-2
hostname(if-config)# ddns update hostname asa.example.com
Step 3
To enable the DHCP client feature on the interface, enter the following commands:
hostname(if-config)# dhcp client update dns server none
hostname(if-config)# ip address dhcp
Step 4
To configure the DHCP server to override the client update requests, enter the following command:
hostname(if-config)# dhcpd update dns both override