[89423] in North American Network Operators' Group
Re: DNS TTL adherence
daemon@ATHENA.MIT.EDU (Joe Maimon)
Tue Mar 14 21:33:09 2006
Date: Tue, 14 Mar 2006 21:32:40 -0500
From: Joe Maimon <jmaimon@ttec.com>
To: ennova2005-nanog@yahoo.com
Cc: "Thurman, Steven" <steven.thurman@wamu.net>, nanog@merit.edu
In-Reply-To: <20060315013551.24990.qmail@web30408.mail.mud.yahoo.com>
Errors-To: owner-nanog@merit.edu
ennova2005-nanog@yahoo.com wrote:
> Although you asked for DNS servers - it helps to remember that no matter
> what the servers and resolvers do - IE will bring that behaviour to
> naught in many cases
>
> http://support.microsoft.com/default.aspx?scid=KB;en-us;263558
>
>
> */"Thurman, Steven" <steven.thurman@wamu.net>/* wrote:
>
> Does anyone know if there is a research paper or statistics related
> to what percentage of DNS servers do not adhere to advertised TTL
> ’ s? I am looking for some verifiable research on this topic if it
> is available.
> Thanks,
>
> Steve
>
>
And the dnscache resolver cache service in win2k and up.
http://support.microsoft.com/kb/318803/en-us
http://support.microsoft.com/kb/245437/EN-US/
If you are expecting hot cutovers to anything by utilizing DNS, sure
seems that you need to expect to support traffic to the values of the
old records for some time.
And if you are expecting very long TTL's to give you extra insurance for
outages and what-nots, expect spotty effectiveness.
