Re: [dnssd] Benjamin Kaduk's No Objection on draft-ietf-dnssd-prireq-05: (with COMMENT)

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Sat, 07 March 2020 07:43 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Christian Huitema <huitema@huitema.net>, Benjamin Kaduk <kaduk@mit.edu>, The IESG <iesg@ietf.org>
CC: "dschinazi.ietf@gmail.com" <dschinazi.ietf@gmail.com>, "dnssd@ietf.org" <dnssd@ietf.org>, "dnssd-chairs@ietf.org" <dnssd-chairs@ietf.org>, "draft-ietf-dnssd-prireq@ietf.org" <draft-ietf-dnssd-prireq@ietf.org>
Thread-Topic: [dnssd] Benjamin Kaduk's No Objection on draft-ietf-dnssd-prireq-05: (with COMMENT)
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Date: Sat, 7 Mar 2020 07:43:14 +0000
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Subject: Re: [dnssd] Benjamin Kaduk's No Objection on draft-ietf-dnssd-prireq-05: (with COMMENT)
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Ben

About your comment in section 3.4.2, Christian is correct on the two points:
- multicast over WiFi is sent over the same channel as unicast but indeed 'waste' bandwidth (probably what you meant by 'spectrum')
- the prireq document is about DNSSD and not on mDNS, so, talking about mDNS is out of scope imho

Regards

-éric

    >
    > 3.4.2
    >
    > I'm given to understand that for many radio technologies, multicast is
    > both effectively broadcast and has specific spectrum
    > requirements/properties that make it especially scarce, compared to
    > unicast spectrum.
    
    I am not sure about the spectrum requirements. AFAIK, for Wi-Fi, unicast
    and multicast operate on the same frequencies and the same channel.
    Multicast requires transmitting at the lowest data rate acceptable for
    all recipients, which means that the transmission of a multicast message
    may last longer than the transmission of a unicast message, maybe much
    longer, and that means occupying the spectrum for a longer time. On the
    other hand, the same transaction using unicast would require several
    messages, and that too creates requirements on the channel. I am
    concerned that explaining the issue with fairness would require a long
    development.
    
    MDNS does rely on multicast, and writing something about the cost of
    multicast would beg the question, what about MDNS? That's a fine
    discussion to have in the DNSSD working group but, again, I don't think
    the privacy requirement document is the right place for that.
    
    Now, if you have a good citation, we could point at it.
    
    -- Christian Huitema
    
    
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