On 28/03/2014 06:09, Hongyi Zhao wrote:
In addtition, I also want to have long TTL so that I can obtain a short
inquiry respond time.
Bind 9.10 might help in this regard - by refreshing cached records
before they expire, rather than by faking their expiry time. From the
change log:
3703. [func] To improve recursive resolver performance, cache
records which are still being requested by clients
can now be automatically refreshed from the
authoritative server before they expire, reducing
or eliminating the time window in which no answer
is available in the cache. See the "prefetch" option
for more details. [RT #35041]
Note that 9.10 is still in beta (http://www.isc.org/downloads/).
Small nit for ISC - the download page suggests there is an ARM for 9.10,
linking to http://www.isc.org/downloads/bind/doc/bind-9-10/ - but that
page contains the ARM for 9.9 (and thus, no details on prefetch). The
download for 9.10b2 does contain an ARM with details on prefetch.
Graham
--
Graham Clinch
Systems Programmer,
Lancaster University
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