What is Anycast DNS?
"Anycast DNS" is a combination of both technologies to use the advantages of Anycast in the demanding DNS. Instead of a one-to-one relationship like unicast, Anycast connects one IP address on the Internet to several DNS servers. In the case of a query (e.g. by calling google.de) the request can be answered by a number of servers, usually the geographically closest server responding. This reduces latency worldwide, increases availability of the respective DNS service and provides additional protection against DDoS attacks. A simple concept which, in contrast to unicast, meets today's requirements for server infrastructures