[dns-operations] TC=1 with RA=0 from a recursive resolver

P Vixie paul at redbarn.org
Fri Mar 18 20:10:11 UTC 2016


On March 18, 2016 12:20:04 PM PDT, Florian Weimer <fweimer at redhat.com> wrote:
>We have received a bug report that our stub resolver does not retry
>TCP when asked to do so by some Google DNS resolvers:
>  https://bugzilla.redhat.com/show_bug.cgi?id=1319296
>The reason is that we check for RA=0 first and treat the server as
>unusable if the bit is cleared.  Only after that, we check the TC bit.
>We could easily check the TC bit first, but not setting RA=1 on a
>recursive response when you are actually willing to provide recursion
>looks like a server bug.
>dns-operations mailing list
>dns-operations at lists.dns-oarc.net
>dns-jobs mailing list

Sent from my Android device with K-9 Mail. Please excuse my brevity.
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