Anycast Address in IPv6

An anycast address is an address that can exist more than once anywhere in the network.
Anycasting is a method used to advertise one IP address from multiple points in the network topology, and with the help of dynamic routing method, the traffic is delivered to the nearest point.

Although anycast works by having multiple receivers, only one receiver is selected from all the available ones.

This kind of address is basically enabling us to have servers and services physically closer to us as they would be if the unicast address was used. It this way we are able to have, for example, a server with one anycast IP address somewhere in US and other server with same service and same IP address somewhere is Europe.

Based on routing protocols, the DNS request will be sent to the nearest server to the requester.

Benefits of Anycast


When you deploy identical servers at multiple nodes, on multiple networks, in widely diverse geographical locations, all using Anycast, you're effectively adding global load-balancing functionality to your DNS service.
On the Web, having a fast site is not only a user experience issue. Now, the speed with which pages load is even alleged to be used as a factor in search engine rankings.
Naturally, anything an organization can do to improve performance is desirable, and Anycast can help towards that objective


 While distributed denial of service attacks are, as the name suggests, distributed, the botnets used to launch the attacks tend not to be distributed evenly.
If an organization were to come under attack by virus or ‘bot’ and it had broadly deployed Anycast-enabled DNS nodes, it can have seen some locations absorb the brunt of the attack.

1.4         Anycast Fault Tolerance

 Anycast provides a high level of fault tolerance, because different nodes can have the same IP. Routes will be installed of the other node in the router's DB, but only the most efficient route will be advertised. Please see diagram below.




I hope this article was helpful and informative.

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