tags 588431 +wontfix thanks well -- if it indeed comes from 192.168.0.32, then you better alarm your local network administrator since it is a private net address. Not sure why/how your DNS resolves it to reserved example.com either.
Altogether, not sure if adding a rule catching 'reverse mapping
checking' failures, since, as I pointed out above, then any
misconfiguration (attack on) of DNS server might lead to the wave of
fail2ban actions against possibly valid users (this line btw does not
give any information that user has tried to authenticate with incorrect
credentials). So for now tagging it as wontfix.
If you feel strong that such feature would be valid, keep the dialog.
Cheers,
--
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