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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: VeriSign's rapid DNS updates in .com/.net (fwd from ml)
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 <[email protected]> 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: [email protected] > > [mailto:[email protected]] On Behalf Of > > > > Daniel Karrenberg > > > > Sent: Thursday, July 22, 2004 3:12 AM > > > > To: Matt Larson > > > > Cc: [email protected] > > > > 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 > > > > > > > >
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