I don't believe there is any way to prevent that from happening. Some ISP's configure their DNS servers to override your TTL settings and can keep things cached in DNS for as long as 48 hours (from what I hear). The only thing that I could think of doing what you already did in this case would be to set up a router or proxy server on the old address space to do do some translation while that block is still active. Starting such cutovers early Saturday morning is also probably a good idea :)
Matt
Charles Frolick wrote:
I just finished moving all of my servers to all new boxes on a new backbone connection with my own ARIN designation. The problem I seem to suffering from is, even though I have 1 hour TTL's some ISP's are taking days to refresh the records for many of the servers and the hosted domains. I moved the Mail server and DNS servers about 2 weeks earlier with no problems, but the others are killing me since now I have a lot of customers complaining they can't see or modify their sites. I have checked DNSStuff and many similar sites, and all say everything is correct, yet customers still see the wrong thing, even after ipconfig /flushdns on XP and 2k.
Everything has been moved now, and is coming back to normal, however, I would like to be able to prevent it in the future, I will be moving servers from other companies into my address space (we are aquiring).
My zone is argolink.net, and one zone I had particular problems with is houstonsweddingguide.com. If you want more examples, I have plenty of zones to poke at.
Thanks,
Chuck Frolick
ArgoLink.net
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