Re: [DNSOP] New Version Notification for draft-pusateri-dnsop-update-timeout-00.txt

Tom Pusateri <pusateri@bangj.com> Mon, 27 August 2018 19:34 UTC

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From: Tom Pusateri <pusateri@bangj.com>
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Date: Mon, 27 Aug 2018 15:34:22 -0400
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To: Ted Lemon <mellon@fugue.com>
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Subject: Re: [DNSOP] New Version Notification for draft-pusateri-dnsop-update-timeout-00.txt
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Not true. You have PTR records with the same service name from multiple clients each with different RDATA and unique timeouts as I demonstrated yesterday in the example.

Tom


> On Aug 27, 2018, at 3:27 PM, Ted Lemon <mellon@fugue.com>; wrote:
> 
> For service instance names, there is only one service. So there shouldn’t be a problem. 
> 
> On Mon, Aug 27, 2018 at 2:28 PM Tom Pusateri <pusateri@bangj.com <mailto:pusateri@bangj.com>> wrote:
> Because even if you add TYPE, you have multiple PTR records (instance names) with the same owner name, class, and type that can timeout differently.
> 
> Tom
> 
>> On Aug 26, 2018, at 11:20 PM, Ted Lemon <mellon@fugue.com <mailto:mellon@fugue.com>> wrote:
>> 
>> If we do that, why do we need a hash at all?
>> 
>> On Sun, Aug 26, 2018 at 10:51 PM Mark Andrews <marka@isc.org <mailto:marka@isc.org>> wrote:
>> I would add a covered type field to TIMEOUT (c.f. RRSIG).  I also wouldn’t have more than
>> a single timeout per record.  I’m tempted to say a single hash as well.  If there is multiple
>> timeouts per record then the blocks need to be sorted in timeout order.
>> 
>> Covered is there to reduce the number of RR’s that need to be hashed to remove a record.
>> It will also reduce the size of IXFR’s as you don’t need to re-construct a new TIMEOUT
>> record that covers every timeout at a name on each change.
>> 
>> For all records at a name is often more expensive that for all records of type covered.
>> Name servers are optimised for looking up <name,type,class> tuples rather than <name,class>
>> tuples.
>> 
>> Sorting of timeout blocks is so that you can look at the first timeout when working out
>> which TIMEOUT needs to be processed first in a zone.
>> 
>> -- 
>> Mark Andrews, ISC
>> 1 Seymour St., Dundas Valley, NSW 2117, Australia <https://maps.google.com/?q=1+Seymour+St.,+Dundas+Valley,+NSW+2117,+Australia&entry=gmail&source=g>
>> PHONE: +61 2 9871 4742              INTERNET: marka@isc.org <mailto:marka@isc.org>
>> 
> 
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