Negative caching config
Barry Margolin
barmar at alum.mit.edu
Wed Mar 3 18:03:52 UTC 2004
In article <c24arr$2804$1 at sf1.isc.org>,
J Marquez <sunsol19712003 at yahoo.es> wrote:
> We are pretty new by configuring DNS. We would like to activate "negative
> cache" in our Cache DNS's. We have searched the archives to look for a
> specific procedure, but haven't found anyone (sorry, if this question is
All BIND 8 or 9 releases from the last 5 years implement negative
caching by default; you don't have to do anything to enable it.
> alredy solved in one of them). We think we have to add
> "max-ncache-ttl <time_to_live_of_caching>
> in named.conf but not sure if its necessary additional steps or it does
> matter the position of this line inside named.conf
"max-ncache-ttl" just allows you to set a cap on the negative cache
time. It's not normally needed.
> Also for a cache DNS, what would be the ideal TTL for Negative Cache?
That's not controlled on the caching DNS, it's set in the SOA records of
the domains.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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