Cisco ASA 5540

CHAPTER
11-1
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
11
Configuring Dynamic DNS
This chapter describes how to configure DDNS update methods, and includes the following topics:
• Information about DDNS, page 11-1
• Licensing Requirements for DDNS, page 11-1
• Guidelines and Limitations, page 11-2
• Configuring Dynamic DNS, page 11-2
• DDNS Monitoring, page 11-4
• Feature History for DDNS, page 11-4
Information about DDNS
DDNS update integrates DNS with DHCP. The two protocols are complementary: DHCP centralizes and
automates IP address allocation; DDNS update automatically records the association between assigned
addresses and hostnames at pre-defined intervals. DDNS allows frequently changing address-hostname
associations to be updated frequently. Mobile hosts, for example, can then move freely on a network
without user or administrator intervention. DDNS provides the necessary dynamic update and
synchronization of the name-to-address mapping and address-to-name mapping on the DNS server. To
configure the DNS server for other uses, see the “Configuring the DNS Server” section on page 9-10. To
configure DHCP, see the “Configuring a DHCP Server” section on page 10-5.
Licensing Requirements for DDNS
Table 11-1 shows the licensing requirements for DDNS.
Table 11-1 Licensing Requirements
Model License Requirement
All models Base License.