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+1. Round robin DNS has worked well for me in the past,

Round robin DNS is fine if you don't have any sticky session requirements.

There simply is no way to guarantee that a user will remain on one host for the duration of a session, if you use round-robin DNS (or even semi-deterministic DNS like F5 or GSS).

Your best efforts will be thwarted by load-balanced browsing proxies that 'optimise' the user experience by querying primary and secondary DNS, then distributing your HTTP requests across multiple servers. HTH

Not requiring sticky sessions is one of it goals when wrting apps. It's not always easy (or even possible) but I love the freedom it buys me.

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