Re: [dnssd] SRP: support of SRP message with zero service?
Ted Lemon <mellon@fugue.com> Wed, 07 December 2022 13:30 UTC
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From: Ted Lemon <mellon@fugue.com>
Date: Wed, 07 Dec 2022 08:30:17 -0500
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To: Esko Dijk <esko.dijk@iotconsultancy.nl>
Cc: Kangping Dong <wgtdkp@google.com>, "dnssd@ietf.org" <dnssd@ietf.org>
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Subject: Re: [dnssd] SRP: support of SRP message with zero service?
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Oh my. I’m not sure I want to know any more details about this use case. :) Op wo 7 dec. 2022 om 08:29 schreef Esko Dijk <esko.dijk@iotconsultancy.nl> > > E.g. so you can ssh to your laptop by name. > > > > Or, try to ssh into your light bulb by using the password “admin” – a > somewhat different IoT usecase ;-) > > > > Esko > > > > *From:* Ted Lemon <mellon@fugue.com> > *Sent:* Wednesday, December 7, 2022 13:56 > *To:* Esko Dijk <esko.dijk@iotconsultancy.nl> > *Cc:* Kangping Dong <wgtdkp@google.com>; dnssd@ietf.org > *Subject:* Re: [dnssd] SRP: support of SRP message with zero service? > > > > Also bear in mind that SRP isn’t just for the constrained device use case. > There may be cases where it’s useful to register a well known name and > unnecessary to advertise a service. E.g. so you can ssh to your laptop by > name. > > > > Op wo 7 dec. 2022 om 07:52 schreef Esko Dijk <esko.dijk@iotconsultancy.nl> > > Yes we have, the link to the start of the thread is: > https://mailarchive.ietf.org/arch/msg/dnssd/01voO6MkMBBvxeInncR6e-3u1bM/ > > (somewhat long discussion) > > > > One use case mentioned also is an SRP client adding or removing an IP > address in its registration, while keeping its services unchanged. > > > > Esko > > > > *From:* Kangping Dong <wgtdkp@google.com> > *Sent:* Wednesday, December 7, 2022 12:48 > *To:* Esko Dijk <esko.dijk@iotconsultancy.nl> > *Cc:* Ted Lemon <mellon@fugue.com>; Abtin Keshavarzian <abtink@google.com>; > DNSSD <dnssd@ietf.org>; Jonathan Hui <jonhui@google.com> > *Subject:* Re: SRP: support of SRP message with zero service? > > > > > Why is it useful to have a hostname and address generally? :) > > > > If the client knows only the hostname and address, it doesn't know what > protocol should be used to communicate with the device, so it doesn't seem > to be useful to > > know only the address. One use case in my mind is that a device may > register a well-known hostname, but didn't find a real case in local > constraint networks... > > > > > I recall that we discussed that a device could temporarily not have a > particular service; and some expectation that in due time a service will > become available again. > > > During this time the device wants to keep its name registered, to show > that it is still there and functional, and defend its name against > potential other devices taking that name. > > *> *So one use case is deleting its service(s) but keeping the name > registered. > > > > Will this encourage devices to always register their hostname even when > they don't provide any service? Do we have a link to that discussion? @Esko > Dijk <esko.dijk@iotconsultancy.nl> > > > > BRs, > > Kangping > > > > > > > > On Wed, Dec 7, 2022 at 7:32 PM Esko Dijk <esko.dijk@iotconsultancy.nl> > wrote: > > I recall that we discussed that a device could temporarily not have a > particular service; and some expectation that in due time a service will > become available again. > > During this time the device wants to keep its name registered, to show > that it is still there and functional, and defend its name against > potential other devices taking that name. > > > > So one use case is deleting its service(s) but keeping the name registered. > > > > Regards > > Esko > > > > *From:* Ted Lemon <mellon@fugue.com> > *Sent:* Wednesday, December 7, 2022 12:15 > *To:* Kangping Dong <wgtdkp@google.com> > *Cc:* Abtin Keshavarzian <abtink@google.com>; DNSSD <dnssd@ietf.org>; > Esko Dijk <esko.dijk@iotconsultancy.nl>; Jonathan Hui <jonhui@google.com> > *Subject:* Re: SRP: support of SRP message with zero service? > > > > Why is it useful to have a hostname and address generally? :) > > > > Op wo 7 dec. 2022 om 06:09 schreef Kangping Dong <wgtdkp@google.com> > > Hi, > > > > Regarding SRP registration, it's unclear if at least one "Service > Description Instruction" is required in a SRP message when the host is not > being deleted. > > If it's not required to register at least one service, what's the use case > of registering only the host/address? Any examples? (It doesn't seem to be > useful > > to advertise only the host name and addresses with the Advertising Proxy :) > > > > Thanks! > > > > > > > > BRs, > > Kangping > > _______________________________________________ > dnssd mailing list > dnssd@ietf.org > https://www.ietf.org/mailman/listinfo/dnssd > >
- [dnssd] SRP: support of SRP message with zero ser… Kangping Dong
- Re: [dnssd] SRP: support of SRP message with zero… Ted Lemon
- Re: [dnssd] SRP: support of SRP message with zero… Esko Dijk
- Re: [dnssd] SRP: support of SRP message with zero… Kangping Dong
- Re: [dnssd] SRP: support of SRP message with zero… Joe Abley
- Re: [dnssd] SRP: support of SRP message with zero… Esko Dijk
- Re: [dnssd] SRP: support of SRP message with zero… Ted Lemon
- Re: [dnssd] SRP: support of SRP message with zero… Kangping Dong
- Re: [dnssd] SRP: support of SRP message with zero… Esko Dijk
- Re: [dnssd] SRP: support of SRP message with zero… Ted Lemon
- Re: [dnssd] SRP: support of SRP message with zero… Michael Richardson