включен только ssh-iptables. в логах:
2014-09-27 13:57:33,812 fail2ban.filter [20483]: DEBUG Default Callback for Event: <Event dir=False mask=0x2 maskname=IN_MODIFY name='' path=/var/log/messages pathname=/var/log/messages wd=2 >
2014-09-27 13:57:33,812 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,820 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,821 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,821 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,821 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,822 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,822 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,822 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,822 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,823 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,823 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,823 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,823 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,823 fail2ban.filter.datedetector[20483]: DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,824 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,824 fail2ban.filter.datedetector[20483]:
...
...
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DEBUG Got time using template MONTH Day Hour:Minute:Second
2014-09-27 13:57:33,880 fail2ban.filter.datedetector[20483]: DEBUG Matched time template MONTH Day Hour:Minute:Second