RE: VeriSign's rapid DNS updates in .com/.net (fwd from ml)

[Sam Stickland <sam_ml () spacething org>]

I think I ought to qualify my earlier email - I certainly didn't mean to 
suggest that this would happen. I meant to merely comment on what the 
expected increase in load might be if we did see a trend towards lower 
TTLs.

Any trend towards lower TTLs would be outside of Verisign's control 
anyhow, and if it did happen, it would no doubt be a gradual effect. Which 
brings me back to my original question - does anyone know of any stastics 
for TTL values?

Sam

On Thu, 22 Jul 2004, Henry Linneweh wrote:

> Before a big panic starts, they can restore it back to
> the way it was if there is an event of such proportion
> to totally hoze the entire network or any major
> portion of it, until they fix any major issue with
> these changes....
>
> -Henry
>
> --- Sam Stickland <sam_ml () spacething org> wrote:
> > Well, a naive calculation, based on reducing the TTL
> > to 15 mins from 24
> > hours to match Verisign's new update times, would
> > suggest that the number
> > of queries would increase by (24 * 60) / 15 = 96
> > times? (or twice that if 
> > you factor in for the Nyquist interval).
> >
> > Any there any resources out there there that have
> > information on global 
> > DNS statistics? ie. the average TTL currently in
> > use.
> >
> > But I guess it remains to be seen if this will have
> > a knock on effect like 
> > that described below. Verisign are only doing this
> > for the nameserver 
> > records at present time - it just depends on whether
> > expection for such 
> > rapid changes gets pushed on down.
> >
> > Sam
> >
> > On Thu, 22 Jul 2004, Ray Plzak wrote:
> >
> > > Good point!  You can reduce TTLs to such a point
> > that the servers will
> > > become preoccupied with doing something other than
> > providing answers.
> > > Ray
> > >
> > > > -----Original Message-----
> > > > From: owner-nanog () merit edu
> > [mailto:owner-nanog () merit edu] On Behalf Of
> > > > Daniel Karrenberg
> > > > Sent: Thursday, July 22, 2004 3:12 AM
> > > > To: Matt Larson
> > > > Cc: nanog () merit edu
> > > > Subject: Re: VeriSign's rapid DNS updates in
> > .com/.net
> > > > Matt, others,
> > > >
> > > > I am a quite concerned about these zone update
> > speed improvements
> > > > because they are likely to result in
> > considerable pressure to reduce
> > > > TTLs **throughout the DNS** for little to no
> > good reason.
> > > > It will not be long before the marketeers will
> > discover that they do not
> > > > deliver what they (implicitly) promise to
> > customers in case of **changes
> > > > and removals** rather than just additions to a
> > zone.
> > > > Reducing TTLs across the board will be the
> > obvious *soloution*.
> > > > Yet, the DNS architecture is built around
> > effective caching!
> > > > Are we sure that the DNS as a whole will remain
> > operational when
> > > > (not if) this happens in a significant way?
> > > >
> > > > Can we still mitigate that trend by education of
> > marketeers and users?
> > > > Daniel