[dns-operations] DNS "get new data" bit (Was: The perils of retroactive DNSSEC validation

Skywing Skywing at valhallalegends.com
Mon Nov 17 17:35:25 UTC 2008

It is certainly often used for images and that sort of content.  However, much hypertext is dynamically generated nowadays.

It is more that many hypertext things are not as static as they used to be, I think, than an abuse of cache control mechanisms.  And yes, some types of dynamic content are practically cacheable if one spent enough work on the dynamic content generation backend bits, but it often a matter of diminishing returns for many (though not all) classes of sites.

- S

-----Original Message-----
From: Duane Wessels <wessels at dns-oarc.net>
Sent: Monday, November 17, 2008 11:21
To: Stephane Bortzmeyer <bortzmeyer at nic.fr>
Cc: dns-operations at mail.dns-oarc.net <dns-operations at mail.dns-oarc.net>
Subject: Re: [dns-operations] DNS "get new data" bit (Was: The perils of retroactive DNSSEC validation

On Mon, 17 Nov 2008, Stephane Bortzmeyer wrote:

> On Fri, Nov 14, 2008 at 08:57:30PM +0100,
> Florian Weimer <fw at deneb.enyo.de> wrote
> a message of 52 lines which said:
>> The initiator could set a flag, similarly to the RD bit, which
>> requests new data.  This has been implemented for HTTP, for
>> instance.
> Experience with HTTP shows a lot of abuse, because people have an
> irrational fear of caches and therefore tend to request new data at
> every opportunity.

Agreed.  HTTP caching is almost worthless these days because both
clients and servers have a too much control over if and how data
can be cached.  Let's not ruin it for DNS also.

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