[dns-operations] dns-operations at lists.dns-oarc.net

Steven Carr sjcarr at gmail.com
Mon May 7 18:27:49 UTC 2012

I think you'll probably find that, averaged out over say a period of 1
hour, an active user will perform at least 1 query every 1-2 seconds.

Twitter, Facebook, anything that uses Ajax and not to mention tons of other
CDNs, Ad Networks etc. eat DNS queries like candy and then the underlying
OS querying for various services which will inevitably end up at your

Then don't forget IPv6, most of the new browsers already send a query for
AAAA at the same time they query for A.


On 7 May 2012 14:42, bert hubert <bert.hubert at netherlabs.nl> wrote:

> On Mon, May 07, 2012 at 09:13:50AM -0400, Stephane Handfield wrote:
> > Hello DNS operators,
> >
> > I want to know what rules you follow in terms of capacity planning for
> your
> > DNS. I am mainly interested in the best planning practice for caching
>  DNS.
> > Definitly our rules need to reflect a lots of our own reality, in term of
> > agility of deployment, risks, etc. But I'm really interested to know if
> > exists any rule of thumb which mostly apply to any situations.
> Here's one. One resolving request per 'broadband residential internet'
> subscriber per ten seconds.  This is the 'smooth peak nuber'.
> Holds up quite well, although this number is a bit old. It might be eeking
> towards one request per five seconds now.
> Adjust width of thumb accordingly!
>        Bert
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