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    Trevor, why don't you just pay $5/month for a VPS somewhere out on
    the 'net (in Canada, even!) with static IP addresses and use that as
    your central coordination point?  If it's still just the principle
    of the thing, well, keep flogging away at it.<br>
    -Adam<br>
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    <div class="moz-cite-prefix">On 16-04-07 05:50 PM, Hartmut W Sager
      wrote:<br>
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cite="mid:CAGQr3cVr4pmw58BN6qJQrb_A6HekMRjvJEGZkJoLnSa6CkwbnA@mail.gmail.com"
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          style="font-family:verdana,sans-serif;font-size:small;color:rgb(0,0,0)">But
          obviously, no number of local parameters can dictate what
          happens to DNS resolving beyond your local infrastructure
          (LAN).  Even if there were parameters that "suggest" behaviour
          to upstream servers, those servers could ignore that.  I
          suspect that full zone file retrieval (or full zone file
          content retrieval) commands might be the only way to be sure
          that caching is bypassed.<br>
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                          <div dir="ltr"><font size="2"><span
                                style="font-family:verdana,sans-serif">Hartmut
                                W Sager - Tel +1-204-339-8331,
                                +1-204-515-1701, +1-204-515-1700,
                                +1-810-471-4600, +1-909-361-6005<br>
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          <div class="gmail_quote">On 7 April 2016 at 07:51, <a
              moz-do-not-send="true"
              href="mailto:wyatt@prairieturtle.ca"><a class="moz-txt-link-abbreviated" href="mailto:wyatt@prairieturtle.ca">wyatt@prairieturtle.ca</a></a>
            <span dir="ltr">&lt;<a moz-do-not-send="true"
                href="mailto:wyatt@prairieturtle.ca" target="_blank">wyatt@prairieturtle.ca</a>&gt;</span>
            wrote:<br>
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              .8ex;border-left:1px #ccc solid;padding-left:1ex">
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                  <div dir="ltr">dig has parameters to force cache
                    bypass.</div>
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                    <div dir="ltr">Daryl</div>
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                <div>----- Reply message -----<br>
                  From: "Trevor Cordes" &lt;<a moz-do-not-send="true"
                    href="mailto:trevor@tecnopolis.ca" target="_blank">trevor@tecnopolis.ca</a>&gt;<br>
                  To: "Robert Keizer" &lt;<a moz-do-not-send="true"
                    href="mailto:robert@keizer.ca" target="_blank">robert@keizer.ca</a>&gt;<br>
                  Cc: "Continuation of Round Table discussion" &lt;<a
                    moz-do-not-send="true"
                    href="mailto:roundtable@muug.mb.ca" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:roundtable@muug.mb.ca">roundtable@muug.mb.ca</a></a>&gt;<br>
                  Subject: [RndTbl] programatically determine if DNS is
                  down or blocked?<br>
                  Date: Wed, Apr 6, 2016 15:41</div>
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                <pre style="word-wrap:break-word;white-space:pre-wrap">On 2016-04-06 Robert Keizer wrote:
&gt; Why don't you use dig+grep+sed in bash?

Ya, that's one of the ideas (dig).  It looks like dig will
differentiate between named down, vs blocked 53, vs simple invalid
domain.

I'm trying to see if there are other ways also, perhaps ones that don't
require a fork.  And the dig will send out real queries to real
servers, but I guess it will be tempered by the cache?  I'll have to
test what dig does in the different failure modes when a) resolving a
domain that isn't cached vs b) resolving one that is cached.
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