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[Anima] Constrained-join-proxy: use of DNS-SD discovery of a Join Proxy

Esko Dijk <esko.dijk@iotconsultancy.nl> Tue, 30 November 2021 12:56 UTC

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From: Esko Dijk <esko.dijk@iotconsultancy.nl>
To: "anima@ietf.org" <anima@ietf.org>
CC: "draft-ietf-anima-constrained-join-proxy@ietf.org" <draft-ietf-anima-constrained-join-proxy@ietf.org>
Thread-Topic: Constrained-join-proxy: use of DNS-SD discovery of a Join Proxy
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Date: Tue, 30 Nov 2021 12:55:55 +0000
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Subject: [Anima] Constrained-join-proxy: use of DNS-SD discovery of a Join Proxy
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While reviewing latest updates; one other issue came up: the draft (re latest in Github) currently mentions DNS-SD as a means for a Pledge to discover a Join Proxy.
But for DNS-SD discovery I believe a service name is needed; see RFC 6763 Section 7.  But there’s no service name yet defined for a Join Proxy.

Easiest solution would be to remove the entire DNS-SD sentence and reference.   I.e. defer this to a future document.

If not removed, we probably need to add a service name registration for Constrained Join Proxy such that it can advertise its service and port over DNS-SD/mDNS correctly.

(Note: the above is unrelated to my earlier remark on requiring a service name for the Registrar’s JPY protocol support. This could also be discovered over DNS-SD/mDNS but would need a separate service name.)

Best regards
Esko

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