Reverse lookups for banned and exception IP lists

If set to on, DansGuardian will look up the forward DNS for the IP
of the connecting computer. This means you can put in hostnames in
the exceptioniplist and bannediplist.
If a client computer is matched against an IP given in the lists, then the
IP will be recorded in any log entries; if forward DNS is successful and a
match occurs against a hostname, the hostname will be logged instead.
It will reduce searching speed somewhat so unless you have a local DNS server,
leave it off.
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