Are you a registrar of The Swedish Internet Foundation? Do you manage domain names and the zones for your customers? Would you like to add another layer of performance and DDOS-protection to your services? Then Registrar Anycast is for you.
While traditional name servers (often referred to as unicast name servers) is one machine in one place answering all DNS-queries that is sent to its IP-address. This means that if that one server is attacked by a DDOS-attack (distributed denial of service) or for any another reason goes offline, queries will no longer be answered by that name server. If the domain name the query is about has no other name servers to ask, then the domain name itself if not resolving at all.
Where unicast name servers is one server per ip-address, anycast name servers are many. By using the functionality of internet routing (to send any packet to the closest destination with the ip-address of the recipient) anycast name servers consists of two or more nodes that all announce the same ip-adress. Not only does this mean that a question asked will get its respons from the closest node (based on routing hops on the internet), it also means that if one node goes offline due to an attack or any other reason, it can be unannounced and the other nodes in the anycast cloud can answer the queries instead.
Instead of having just the one name server behind every record, you should have many!