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Возможно попытка перебора пароля. Как защитить?


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Здравствуйте, сегодня обнаружил такие записи в логе

Цитата

Bad password attempt for 'root' from 8.142.96.158:41670
Авг 10 14:10:39 dropbear[2933]
Exit before auth from <8.142.96.158:41670>: (user 'root', 1 fails): Exited normally
Авг 10 14:10:39 dropbear[2943]
Child connection from 8.142.96.158:42384
Авг 10 14:10:41 dropbear[2943]
Bad password attempt for 'root' from 8.142.96.158:42384
Авг 10 14:10:42 dropbear[2953]
Child connection from 8.142.96.158:43294
Авг 10 14:10:42 dropbear[2943]
Exit before auth from <8.142.96.158:42384>: (user 'root', 1 fails): Exited normally
Авг 10 14:10:44 dropbear[2953]
Bad password attempt for 'root' from 8.142.96.158:43294
Авг 10 14:10:45 dropbear[2953]
Exit before auth from <8.142.96.158:43294>: (user 'root', 1 fails): Exited normally
Авг 10 14:10:46 dropbear[2976]
Child connection from 8.142.96.158:44486
Авг 10 14:10:47 dropbear[2976]
Bad password attempt for 'root' from 8.142.96.158:44486
Авг 10 14:10:48 dropbear[2987]
Child connection from 8.142.96.158:45518
Авг 10 14:10:48 dropbear[2976]
Exit before auth from <8.142.96.158:44486>: (user 'root', 1 fails): Exited normally
Авг 10 14:10:50 dropbear[2987]

Я так понимаю это идет перебор пароля для пользователя root. 

Подскажите как защититься?

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