Negative caching config

[Barry Margolin]

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
*** PLEASE post questions in newsgroups, not directly to me ***