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[homenet] Understanding DNS-SD hybrid proxying [was: Firewall hole punching]

Juliusz Chroboczek <jch@irif.fr> Wed, 23 November 2016 19:45 UTC

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Date: Wed, 23 Nov 2016 20:45:41 +0100
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From: Juliusz Chroboczek <jch@irif.fr>
To: Markus Stenberg <markus.stenberg@iki.fi>
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Cc: homenet@ietf.org
Subject: [homenet] Understanding DNS-SD hybrid proxying [was: Firewall hole punching]
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>>> - ohybridproxy (only really scalable and sensible IPv6 rdns source that
>>> I am aware of, given nodes talk mdns)

>> Noted, thanks for the opinion.  I still don't understand how it works (who
>> gets port 53?  how are data from multiple links merged?), but I intend to
>> do my homework.

> I give dnsmasq port 53, and then have it forward queries for .home
> (chuckle) and my IPv4/IPv6 reverses in .arpa-land to 127.0.0.1:54 where
> ohp listens on my routers.

Ok, makes sense (except for the choice of 54).  Two more questions:

  - who merges data from multiple links?  (I'd wish that the hybrid
    proxies compute a minimal spanning tree and perform peer-to-peer
    magic, but I suspect you're generating a config file dynamically
    and restarting dnsmasq whenever the set of hybrid proxies changes.)

  - who speaks mDNS?  The Hybrid proxies?  Or do they communicate with
    a dedicated mDNS speaker?

-- Juliusz

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