[nsd-users] nsd does not fallback to axfr when ixfr doesn't work

Matthijs Mekking matthijs at NLnetLabs.nl
Thu Aug 28 08:48:32 UTC 2008

Hash: SHA1

Hi Ralf,

Ralf Weber wrote:
>>> So this means that NSD should indeed try with AXFR when it gets an
>>> error, as I understand it.
>> Yes it does, you are right.  Interoperability goes both ways :-)
> Hmm it doesn't or did I miss something - I read this as it will do it in
> future.

Yes, Wouter meant to say: Yes NSD should do this. Currently, NSD is not
following RFC 1995 with respect to AXFR fallback.

> Anyway I have gotten a reply from Nominum and they will fix this, but
> also say that NSD should have retried with an AXFR. It should have
> worked if NSD would have used TCP as transport, but I don't think there
> is an option in the config file to tell NSD to only use TCP for IXFR.

This will be in the next release.

My question to the nsd-users list would be if there is interest in AXFR
fallback when the server does not understand IXFR. My opinion is that
NSD should support it, because we strife to be RFC-compliant.

- - Matthijs
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