North American Network Operators Group
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RE: DNS TTL adherence

  • From: Sharad Agarwal
  • Date: Wed Mar 15 23:25:09 2006 
(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.