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

Ted Lemon <mellon@fugue.com> Tue, 28 August 2018 00:04 UTC

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From: Ted Lemon <mellon@fugue.com>
Date: Mon, 27 Aug 2018 20:04:29 -0400
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To: Mark Andrews <marka@isc.org>
Cc: Tom Pusateri <pusateri@bangj.com>, dnsop WG <dnsop@ietf.org>
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Subject: Re: [DNSOP] New Version Notification for draft-pusateri-dnsop-update-timeout-00.txt
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How do they handle that?

On Mon, Aug 27, 2018 at 8:02 PM Mark Andrews <marka@isc.org>; wrote:

> Active directory has each domain controller updating its own SRV record
> on the same <qname,qtype,qclass> tuple.  These updates happen at different
> times and need to expire if a domain controller becomes unreachable.
>
> A different case is when you have multiple prefixes from different
> providers with different lifetimes.  You then end up with multiple AAAA
> records that need to expire at different times.
>
> Mark
>
> > On 28 Aug 2018, at 8:34 am, Ted Lemon <mellon@fugue.com>; wrote:
> >
> > Sorry, I realized that I accidentally hit "reply" instead of "reply all."
> >
> > The issue that I raised with Tom is that for the DNSSD SRP use case, the
> only names that receive updates from multiple services are service names
> (IOW, not service instance names).   In the case of SRP, PTR RRs in service
> names always point to service instance names, which are per-service, and
> hence can be counted on to expire on a single schedule.   So for the use
> case of SRP, the easiest way to handle deleting service name PTR RRs is to
> take advantage of the semantics of DNSSD: when a service instance SRV
> record expires, also delete the PTR RR on the service name that points to
> it.
> >
> > The reason I bring this up is that it's the most complicated use case I
> know of.   Is there some other use case where we expect more than one DNS
> Update client to be updating RRs of the same type on the same name?   How
> would this even work without SRP semantics?   If this is not expected, then
> any complexity in the timeout RR that's present only to support that use
> case is unnecessary.
> >
> > This is what has been motivating my questions about use cases.   I'm
> sorry I didn't make that clear earlier.
>
> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742              INTERNET: marka@isc.org
>
>