Cisco Cisco IOS Software Release 12.4(9)T

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The Split DNS feature enables a Cisco router to respond to Domain Name System (DNS) queries using 
a specific configuration and associated host table cache that are selected based on certain characteristics 
of the queries. In a Split DNS environment, multiple DNS databases can be configured on the router, and 
the Cisco IOS software can be configured to choose one of these DNS name server configurations 
whenever the router must respond to a DNS query by forwarding or resolving the query. 

Your Cisco IOS software release may not support all of the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, use the 

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image 
support. Access Cisco Feature Navigator at 

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Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at 
the login dialog box and follow the instructions that appear.