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Groups > comp.protocols.dns.bind > #15780

Best way to force a TC=1 response?

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What's the best way to force an A query via UDP to return a TC=1 result:
a really long CNAME chain?

I want to set up a name that can be used in e.g. ping to perform an end
to end resolution check in application context.


The longer version is that there was a thread on postfix-users not too
long ago about the fact that MUSL libc doesn't do TCP (among other
things) and I want a way to test some hardware and statically built
apps. No jumbo frames here.

I was also mildly surprised to discover that glibc doesn't try TCP if
UDP fails to answer; for some reason I thought it did! Instead it
reports "Temporary failure in name resolution" in the ping example.

--

Fred Morris

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Thread

Best way to force a TC=1 response? Fred Morris <m3047@m3047.net> - 2020-05-26 13:50 -0700
  Re: Best way to force a TC=1 response? "John Levine" <johnl@iecc.com> - 2020-05-26 17:27 -0400

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