Slave zone intermittently not refreshing
marka at isc.org
Tue May 13 00:03:44 UTC 2014
In message <alpine.LSU.2.00.1405121147340.1509 at hermes-1.csi.cam.ac.uk>, Tony Finch writes:
> Mart van de Wege <mvdwege at gmail.com> wrote:
> > The only difference I *can* see is that this particular slave zone
> > occasionally gets a lot of updates in a single day, which is when this
> > problem seems to be triggered.
> Is there an MTU problem between your slave and the master? Or a problem
> with fragmented UDP? I wonder if something is screwing up large IXFR
> packets, causing your slave to get stuck - that might explain the
> timeout messages in the log.
> It is a bit difficult to properly test IXFR because dig will only do it
> over TCP (it ignores the +notcp option for AXFR and IXFR). And you can't
> force named to use TCP for IXFR, so getting named and dig to behave the
> same is tricky...
2275. [func] Add support to dig to perform IXFR queries over UDP.
DiG has supported ixfr over udp since 2007. It just defaults to TCP.
you have to disable TCP after specifying ixfr.
dig ixfr=2007111878 dv.isc.org +notcp
> You could try setting "request-ixfr no;" to see if AXFR (over TCP) works
> f.anthony.n.finch <dot at dotat.at> http://dotat.at/
> Shannon: Northwest 5 to 7, decreasing 4 or 5. Rough. Showers, squally at
> first. Good.
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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