On Jun 24, 2009, at 1:54 AM, Scott Haneda wrote:
On Jun 23, 2009, at 11:57 PM, Chris Buxton wrote:
On Jun 23, 2009, at 3:16 PM, Scott Haneda wrote:
Good observation. This is a long standing issue that I assumed
was solved. Named on OS X will go deaf on port 53 tcp for some
reason. I just kicked it, and now I can tcp dig it.
$dig +tcp sugardimplesdesigns.com SOA @ns1.hostwizard.com +short
ns1.hostwizard.com. scott.hostwizard.com. 2009062206 28800 7200
2419200 3600
I now the men and mice guys are familiar with this, if you guys
are reading, have you ever pinned this down, or found a solution
to it?
No, we have not. However, it appears to be related to the port
being idle for some time. Servers that use their TCP port more
frequently, usually due to having lots of zone updates that need to
be replicated to slaves, don't appear to be affected. You might try
creating a cron job that digs against the TCP port every 5 minutes
to try to keep the port "active" and prevent it from gong deaf.
I could be wrong, but I seem to recall that we've seen this on
other operating systems as well, although the lion's share of
reports have been with Mac OS X.
In your estimation, a named/BIND bug, or OS level bug? How would
one go about finding out, and working it out, so we can solve this?
I can certainly and very easily shove a launchd job in to run every
5 minutes, and do not even consider it much of a kludge, but would
like to solve it for others, as it is a bear to track down.
I'm not really qualified to determine where the bug is, but I would
guess there's a bug in the IP stack that most other server software
doesn't trigger. Perhaps ISC could find a way to work around it, or
perhaps Apple could fix it.
My WAG is that Apple inherited this bug from *BSD, from which large
portions of the Darwin kernel are (or at least were) derived.
Chris Buxton
Professional Services
Men & Mice
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