mod_defensible
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mod_defensible is Apache 2.x module aiming to forbid IP listed
in DNSBL.
It will do DNS lookups to DNSBL you want and will return a 403 Forbidden
error code to the client.
You can use './configure --with-udns` to enable udns
(http://www.corpit.ru/mjt/udns.html) usage, which should be faster.
Configuration example:
DnsblUse On
DnsblServers bsb.spamlookup.net bl.blbl.org opm.blitzed.org sbl-xbl.spamhaus.org
If compiled with udns support, you can use a special nameserver with:
DnsblNameserver 127.0.0.1
But why mod_defensible?
Because: ^ ^^ ^^
d ns bl