The DNS (Domain Name Servers) is used to maintain a relationship between IP addresses and domain names. DNS is a set of database servers which is used to maintain the relationship between IP addresses and domain names and help in the lookup between the two. Computers use the DNS system to electronically transmit data with other computers through the internet.
In order to configure an internal or external Domain Name System (DNS) server for Cisco VPN Clients on the PIX/ASA, complete these steps:
Access the device using the CLI and go to configuration mode.