Alexandre J. Correa (Onda)
alexandre at onda.net.br
Sun Oct 25 06:55:46 CET 2015
My first e-mail comes with some questions.. :)
1- Unbound can cache NXDOMAIN responses ?
2- Unbound can change/force the TTL of NXDOMAIN as i define ??
the purpose of force/change TTL of NXDOMAIN is for a project to fight
SPAM ak. SPFBL.
Because of the project´s success here (Brazil), i need to increase the
cache of NXDOMAIN on mirror servers to lower cpu usage...
afaik, TTL of NXDOMAIN came from SOA records, but in my tests, unbound
cache responses for only 4 seconds ..
if i flood with 20 queries like:
# dig @localhost 18.104.22.168.dnsbl.spfbl.net
the first query goes to 'central' server -- OK, expected (cache is empty)
the others 19 queries came from cache -- OK, expected
waiting 10 seconds, and flood again..
the first query goes to 'central' server -- NOT OK, expected come from
local cache ...
How i can force the TTL of NXDOMAIN using unbound ??
Alexandre Jeronimo Correa
Office: +55 34 3351 3077
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