Turn off ncache?

[Barry Margolin]

In article <19991130142832D.liman at flaptop.pilsnet.sunet.se>,
Lars-Johan Liman  <liman at sunet.se> wrote:
>In an educational lab environment, I want to turn off negative
>caching, to make changes to the zone files propagate infinitely
>quick.
>
>In named.conf (8.2.2-P5) one can set
>  max-ncache-ttl  nnn;
>to limit the ncache retention time.
>
>Setting the time (nnn) to "2" (seconds) works well, and is adequate
>for all practical purposes.
>
>Setting it to "0" seems to have no effect, and does not turn off
>ncache, as one would expect.
>
>Why?

I suspect the following code in ns_config.c:

	if (!op->max_ncache_ttl)
		op->max_ncache_ttl = DEFAULT_MAX_NCACHE_TTL;

It looks like it detects whether the max-ncache-ttl option was specified by
checking whether this is non-zero.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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