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Re: [DNSOP] DNS names for local networks - not only home residental networks ...

Tony Finch <dot@dotat.at> Wed, 06 September 2017 18:48 UTC

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Date: Wed, 06 Sep 2017 19:48:10 +0100
From: Tony Finch <dot@dotat.at>
To: Paul Vixie <paul@redbarn.org>
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Subject: Re: [DNSOP] DNS names for local networks - not only home residental networks ...
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Paul Vixie <paul@redbarn.org> wrote:
>
> we do not have well defined automation for making local names work when
> the internet connection is down. at a very modest level of necessary and
> inevitable complexity, one's own in-perimeter recursive servers can't
> find one's own in-perimeter authority servers. so if your internet
> connection goes down, then way more stuff becomes effectively
> unreachable than what's on the far side of the disconnection point.
>
> mark andrews faced disconnections of this kind as a daily part of his
> work about 30 years ago when he developed the "stub zone" feature and
> contributed it to BIND4. but we have yet to automate it.

This won't address the deeper problems that you outlined, but...

It occurs to me that this could be made a lot simpler with the right
flavour of metazone / catalogue zone.

On our site we encourage those running BIND to secondary our local zones,
but it's horrible to configure and there's a lot of manualarity to
co-ordinate delegation changes. But it has nice resilience and performance
properties.

However I'm doubtful that it's worth trying to make it possible to
automatically discover a catalogue zone for the local domains on the local
network...

Forwarding to our recursive servers is a lot simpler to configure and has
easier support for DNSSEC validation. Sadly DNSSEC reintroduces the
external dependency problem, but serve-stale should mitigate that when
our recursive servers support it.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Biscay: Westerly or northwesterly 3 or 4, occasionally 5 in north. Moderate,
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