Thanks Ishwor
That's answered my question. If I manage to recompile gethostbyname
appropriately, I'll report some results here.
Cheers,
b
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Today's Topics:
1. Re: debugging dns resolution issues with RES_OPTIONS="debug"
(Ishwor Gurung)
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Subject:
Re: [SLUG] debugging dns resolution issues with RES_OPTIONS="debug"
From:
Ishwor Gurung <[email protected]>
Date:
Wed, 27 Jan 2010 22:35:10 +1100
To:
[email protected]
To:
[email protected]
2010/1/27 Ben Burke <[email protected]>:
Rick,
Thanks - yes, that will help, though I don't think I'll get close enough to
the problem to decide if it's ip communications or a windows dns server
issue. (I could do other connectivity tests to the dns servers, same result)
I came across these options when working with a really nasty performance
problem, involving AIX dns clients, resolving names on win2k3 servers. At
the time, I was being pushed to populate hosts files on dozens of unix
hosts, rather than get to the bottom of what was going on. Eventually, we
found that the AIX version in use would attempt ipv6 style dns client
behaviour several times, before failing back to ipv4 behaviour. At the time,
IBM gave us no support what so ever - just blamed microsoft. As usual, the
way to solve a vendor war is, get to the root of the problem.
I'm pretty clueless on where gethostbyname lives in the os. My guess would
be, a shared library that many programs link against, rather than part of
the kernel.. This was the kind of info I was looking for.
Hi Rick
gethostbyname is part of GNU libc implementation. Therefore, you'd
have to check out its resolver library to do anything serious with
`options debug` on your /etc/resolv.conf (its disabled by default for
some reason). Other implementations such as AIX which you use has it
enabled by default. AFAIK, most BSDs have them enabled too. HTH
[...]
--
Regards
Ishwor Gurung
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