[80020] in North American Network Operators' Group
Re: Slashdot: Providers Ignoring DNS TTL?
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Wed Apr 20 20:33:59 2005
Date: Thu, 21 Apr 2005 01:31:04 +0100 (BST)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Dean Anderson <dean@av8.com>
Cc: sthaug@nethelp.no, <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.44.0504201346040.4574-100000@localhost.localdomain>
Errors-To: owner-nanog@merit.edu
On Wed, 20 Apr 2005, Dean Anderson wrote:
> On Wed, 20 Apr 2005 sthaug@nethelp.no wrote:
>
> > > I'd rather expect this sort of behavior with anycasted servers...
> >
> > Where do you see any connection between anycast and ignoring DNS TTL? Or is
> > this just part of your usual rant against anycast DNS service?
>
> The data he showed isn't necessarilly "ignoring ttl". If there are multiple
> anycasted caching servers behind a specific IP address, then those several
> cache's will each have a different state. Since, [as I
I fail to see the correlation still.. anycasted caches should all be operating
independently getting their DNS data from authoritative sources.
If at any point one of them uses a TTL that it has not received from the
authoritative source it is ignoring the ttl, where does anycast get involved
with this particular problem?
thanks
Steve
