Re: [homenet] Updating DNS [was: How many people have installed the homenet code?]

Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> Thu, 12 May 2016 13:11 UTC

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Date: Thu, 12 May 2016 15:10:55 +0200
Message-ID: <874ma3s9pc.wl-jch@pps.univ-paris-diderot.fr>
From: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
To: "Ray Hunter (v6ops)" <v6ops@globis.net>
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Cc: "homenet@ietf.org" <homenet@ietf.org>
Subject: Re: [homenet] Updating DNS [was: How many people have installed the homenet code?]
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If I'm reading you correctly, Ray, you're promoting unstable naming.  If
I have two routers called trurl and pirx in my network, then my printer
will becalled diablo630.pirx.home whe pirx is up, diablo630.trurl.home
when trurl is up, and either I reconfigure all of my hosts every time
I swap a router, or rely on the DNS search list being correct?

> We have multiple independent address spaces (ULA per router + GUA per
> provider),

No, we have a GUA per provider, and *optionally* a single ULA for the
whole Homenet:

      An HNCP router SHOULD create a ULA prefix if there is no other IPv6
      prefix with a preferred time greater than 0 in the network.  It MAY
      also do so if there are other delegated IPv6 prefixes, but none of
      which is locally generated [...]  In case multiple locally generated
      ULA prefixes are present, only the one published by the node with
      the greatest node identifier is kept

> If a new router is added, a new ULA is added,

No, that's not the case.

> If a router is removed or dies, the ULA prefix expires

Nope.  If a router dies, any ULA should remain stable, even if it's the
router who originally generated the ULA that dies:

   When a new ULA prefix is created, the prefix is selected [...] using
   the last non-deprecated ULA prefix

That's the whole point of using a ULA.