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RE: DNS TTL adherence
(re-sending because I wasn't on nanog-post) > For example if we change ip addresses will we need to plan on > 20% traffic at old site on day1, 10% day2, 5%, day3, and so > on...? There are also issues related to proxy servers and > browser caching that are independent of DNS we will need to > quantify to understand full risk. The more data we have will > drive some of our decisions. You might consider the following paper from IMC 2003: "On the Responsiveness of DNS-based Network Control" by Jeffrey Pang, Aditya Akella, Anees Shaikh, Balachander Krishnamurthy, Srinivasan Seshan, http://www.imconf.net/imc-2004/papers/p21-pang.pdf It sheds some light on how widely DNS TTLs are adhered to. The CDF graphs on the 4th page suggest that you should be fairly safe after a day, though I don't see if the paper specifically states what the largest recorded violation was. Sharad.