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[dnssd] Strategy of advertising proxy for hostname conflicts during key lease period? (draft-ietf-dnssd-advertising-proxy-00)

Esko Dijk <esko.dijk@iotconsultancy.nl> Wed, 08 June 2022 13:35 UTC

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From: Esko Dijk <esko.dijk@iotconsultancy.nl>
To: "dnssd@ietf.org" <dnssd@ietf.org>
Thread-Topic: Strategy of advertising proxy for hostname conflicts during key lease period? (draft-ietf-dnssd-advertising-proxy-00)
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Date: Wed, 08 Jun 2022 13:35:32 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnssd/-7Z6iJCDzs4E6Q7vZEEvDSJ42Mk>
Subject: [dnssd] Strategy of advertising proxy for hostname conflicts during key lease period? (draft-ietf-dnssd-advertising-proxy-00)
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Hi all,

Something that could be added to draft-ietf-dnssd-advertising-proxy-00 is the handling of hostname conflicts; and how an advertising proxy would “defend” an SRP registration on the mDNS link side. (There was a previous thread on this too.)

In particular, what if a host registration has already expired but the key-lease is still active? In SRP, then no-one else can claim this hostname. But in mDNS, we don’t seem to have such mechanism i.e. the advertising proxy doesn’t “defend” the hostname registration on the mDNS link. Or does it?
So it could happen that this hostname is claimed on the mDNS side by an mDNS native device, even though a particular SRP client still has the key-lease on this name.

The original name owner (SRP client) could later come back online and it may need to claim the name again – conflicting with the mDNS link.

Best regards
Esko

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