10-7
Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
Chapter 10 Configuring DHCP, DDNS, and WCCP Services
Configuring Dynamic DNS
• Example 4: Client Asks Server To Perform Both Updates; Server Configured to Update PTR RR
Only; Honors Client Request and Updates Both A and PTR RR, page 10-8
• Example 5: Client Updates A RR; Server Updates PTR RR, page 10-9
Example 1: Client Updates Both A and PTR RRs for Static IP Addresses
The following example configures the client to request that it update both A and PTR resource records
for static IP addresses. To configure this example, perform the following steps:
Step 1 To define a DDNS update method called ddns-2 that requests that the client update both the A and PTR
RRs, enter the following commands:
hostname(config)# ddns update method ddns-2
hostname(DDNS-update-method)# ddns both
Step 2 To associate the method ddns-2 with the eth1 interface, enter the following commands:
hostname(DDNS-update-method)# interface eth1
hostname(config-if)# ddns update ddns-2
hostname(config-if)# ddns update hostname asa.example.com
Step 3 To configure a static IP address for eth1, enter the following commands:
hostname(config-if)# ip address 10.0.0.40 255.255.255.0
Example 2: Client Updates Both A and PTR RRs; DHCP Server Honors Client
Update Request; FQDN Provided Through Configuration
The following example configures 1) the DHCP client to request that it update both the A and PTR RRs,
and 2) the DHCP server to honor the requests. To configure this example, perform the following steps:
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 security appliance 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
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