Round Robin DNS provides a way to spread traffic across multiple resources by specifying more than one IP address (A record) or IPv6 address (AAAA record) for the same hostname.
An example would be a pool of web servers or email servers:
www.example.com IN A 10.0.1.16
IN A 10.0.1.17
IN A 10.0.1.18
When our nameservers receive a query for www.example.com they return all of the records, but the order of the records returned is rotated sequentially after each query. If the above snippet depicted a query and response, then the next query would receive the response:
Query
Response
www.example.com
10.0.1.18
10.0.1.17
10.0.1.16
www.example.com
10.0.1.17
10.0.1.18
10.0.1.16
It is important to note that this is not a weighted load balancing solution, it’s a statistical load distributor.
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