copying the question section

Michael Richardson mcr at
Sun Aug 4 16:20:26 UTC 2002


>>>>> "Paul" == Paul Vixie <paul at> writes:
    Paul> bind has always copied the question section into the response.  some versions
    Paul> (notably the ill-fated 4.9.2) demanded to see this, but earlier and current
    Paul> versions only demand that the question section in the response match the one

  So, as I understand this, it will only affect people running old resolvers.

  Unfortunately, the resolvers in libc on many systems have not kept up with
the state of the art, so this may affect more people than one might think
from looking at how many copies of bind 4.9.2 server are deployed.

    Paul> or we could try an adaptive strategy: if truncation occurs while building a
    Paul> response, then try it again with an empty question section, and if truncation
    Paul> still occurs, then give up and set the TC bit.

    Paul> i'm in favour of that last approach.  anybody else got strong views on it?

  I would say that it is a good idea.
  Given EDNS0, the answer is unlikely to grow unless the client is ready for
it, in which case they probably aren't running such an old resolver client.

]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr at |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [

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Comment: Finger me for keys


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