Using Standard DNS for load balancing
DNS can be used for load balancing across multiple servers using the standard round−robin mechanism available in the DNS servers. Each IP address configured for the domain name may actually be a VIP on a load balancer that’s bound to several servers connected to the load balancer. DNS can be used for some rudimentary load balancing across the various individual servers or multiple load balancers at different sites where each load balancer performs server load balancing.
But the DNS has no knowledge of which of the different IP addresses is actually working or how much load is on each one of those sites. A site may be completely inaccessible, but the DNS may continue to provide that IP address as part of its reply. We can’t view this as a shortcoming of the DNS architecture because DNS was never designed for GSLB. It was devised as a way to provide the name−to−address translation.
