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The default settigs of fail2ban are usually good enough but you can also customize fail2ban to suit your needs.
After a day or so on the Internet you should start seeing people getting banned in the logs, /var/log/fail2ban.log. Here is an example of an ip getting banned and then after 10 minutes it unbans,
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This is basic Ubuntu Security. Continue to More Linux Security.
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This article can be enhanced with a strategy and write up on the following triggers,
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covers Intrusion detection and more advanced techniques.