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

Ted Lemon <mellon@fugue.com> Fri, 24 August 2018 18:05 UTC

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From: Ted Lemon <mellon@fugue.com>
Date: Fri, 24 Aug 2018 14:04:26 -0400
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To: Tom Pusateri <pusateri@bangj.com>
Cc: 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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Can you give us an example?

On Fri, Aug 24, 2018 at 1:56 PM Tom Pusateri <pusateri@bangj.com>; wrote:

> Sure. It’s not the thoughtful, well-behaved implementations that we worry
> about. It’s the ones that aren’t. This is a protection mechanism. (Belt AND
> suspenders..)
>
> Thanks,
> Tom
>
>
> On Aug 24, 2018, at 1:36 PM, Ted Lemon <mellon@fugue.com>; wrote:
>
> The DHCP case isn't actually a problem today.   DHCP servers automatically
> remove these records.   The ISC server has been doing this for 20 years,
> and I'm pretty sure all the other servers that compete with it do too.
>
> On Fri, Aug 24, 2018 at 12:50 PM, Tom Pusateri <pusateri@bangj.com>; wrote:
>
>>
>>
>> On Aug 24, 2018, at 9:54 AM, Ted Lemon <mellon@fugue.com>; wrote:
>>
>> On Aug 24, 2018, at 9:52 AM, Tom Pusateri <pusateri@bangj.com>; wrote:
>>
>> Yes, it was intended to be more general than for service registration.
>> It’s directly applicable to name registration for IP addresses. I can add a
>> section on other uses if more motivation is desired. Mark Andrews had some
>> uses as well that hopefully, he can share. If others have uses in mind that
>> this solves I would love to hear about them.
>>
>>
>> The reason I'm asking is not that I don't think there are theoretical use
>> cases for what you are proposing.   I'm asking if there are actual use
>> cases.   How would this be used in practice?   What can't someone do right
>> now that they need to do and that this new technology enables?
>>
>>
>> Specifically, there are two applications mentioned in the draft.
>>
>> 1. When a DNS server receives a dynamic DNS Update from a client
>> registering its name after having received an IP address from an DHCP
>> lease, the length of the DHCP lease can be tied to the length that the DNS
>> address/PTR records stay in the authoritative server.
>>
>> 2. When an RFC 6763 DNS-SD service is registered (including PTR, SRV, &
>> TXT records), these records can timeout according to the lease lifetime
>> contained in the update lease EDNS(0) option.
>>
>> These are not theoretical. They solve practical problems that exist
>> today. I think there are others associated with existing problems for
>> sleeping devices and IoT devices that I need to research to more clearly
>> answer your specific question but I think these two already fulfill that
>> requirement.
>>
>> Tom
>>
>>
>>
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