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Use your Cisco router as a primary DNS server

In IOS release 12.3, most Cisco routers can act as primary DNS servers (formerly, this functionality was only available as part of DistributedDirector product), alleviating the need for a host-based DNS server in your perimeter network. To configure a router to act as primary
DNS server for a zone, use the ip dns primary command, for example:

ip dns server
ip dns primary website.com soa ns.website.com
[email protected] 86400 3600 1209600 86400

Next, you need to define primary and secondary name servers for the domain.
Use the ip host ns command:
ip host website.com ns ns.website.com
ip host website.com ns ns.isp.com
You can also define mail routing for the domain with the ip host mx command:

ip host website.com mx 10 mail.website.com
ip host website.com mx 20 mail.isp.com


Finally, you need to define hosts within your domain (with the traditional form of the ip host command):

ip host ns.website.com 192.168.0.1 ! router's IP address
ip host www.website.com 192.168.1.1
ip host website.com 192.168.1.1 ! alternate for www.website.com
ip host mail.website.com 192.168.1.2