I'm contemplating the idea of providing a DNS hosting service that is based on the idea that we could do tricky DNS stuff that isn't available elsewhere. It will have features like switching A records based on what servers are up or down, which isn't that tricky. but basically - we could do most anything. Time of day - day of week - rotating IP ranges - complex conditionals?
This is something I already developed for my own spam filtering service so I would basically enhance this and offer it to others.
So - my questions ...
1) Is this something anyone would be interested in?
2) If such a service existed to do conditional DNS processing - what would you want it to provide? What DNS switching issues are you currently looking to solve?
Yes - the DNS service would be for failover support so you would need a backup server to switch to.
One other example, suppose someone has a server in their office and they have both a cable modem connection and a DSL connection for backup. If the cable goes down then the DNS system could switch the A record to the DSL IP and back when the cable is restored.