Do many ISP's cache A records with TTL of 0 ?
Mark van Kerkwyk
mark at vk.net
Sat Sep 1 06:48:34 UTC 2001
Thanks Brad,
thanks just want I wanted to hear. This came up in a discussion when
we were going over some GSLB issues and two people stated that *many* ISP's
practiced this, and one other person singled out AOL. I have certainly
never seen it before and I am sure Foundry,Alteon,Cisco etal would have
beat us to creating the page of shame if it was occuring.
Thanks
Mark
Brad Knowles
<brad.knowles at s To: "Mark van Kerkwyk" <mark at vk.net>, bind-users at isc.org
kynet.be> cc:
Sent by: Subject: Re: Do many ISP's cache A records with TTL of 0 ?
bind-users-boun
ce at isc.org
01/09/2001
00:14
At 10:45 AM +0100 9/1/01, Mark van Kerkwyk wrote:
> I was told that a while back AOL used to cache all records for a number
of
> days, irrespective of whether it had a TTL of 0 or anything (eg over 1
> day).
I used to work at AOL, and indeed I was the primary person who
set up their system-wide caching nameserver farm (capable of handling
32,000-64,000 DNS queries per second), and I continue to maintain
contacts there within the DNS Admin group. I've never heard of them
doing anything like this in my life.
> Does anyone know of any ISP's perform this practice and in turn screw up
> any global server load balancing which utilises a TTL of 0, if so, where
> might one find a list of who does this ?
I'm not aware of any ISPs that do this, and if I did, I would
make sure that they are published on a "page of shame".
--
Brad Knowles, <brad.knowles at skynet.be>
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