DNS Round Robin

DNS round robin is a simple load-balancing technique in which multiple [[a-record|A records]] or [[aaaa-record|AAAA records]] with different [[ip-address|IP addresses]] are associated with a single hostname. [[recursive-dns|Resolvers]] rotate through the addresses in sequence, distributing incoming connections across multiple servers. Because round robin relies on DNS-level randomization rather than session awareness, it provides no health checking or sticky sessions; a failed server continues to receive traffic until the records are manually updated or [[ttl|TTL]] expires. More sophisticated alternatives include Anycast routing, GeoDNS, and application-layer load balancers.