DNS TTL adherence

Sharad Agarwal Sharad.Agarwal at microsoft.com
Thu Mar 16 04:23:08 UTC 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,

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.


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