Take a look at your log file (/var/log/secure for Fedora Core 4) and you will discover numerous automated ssh hacking attempts using dictionary attack.考慮一下您的日誌文件（在/ var / log /爭取到的Fedora Core 4 ）你會發現許多自動化的SSH黑客企圖使用字典攻擊。 So now you have identified the offending addresses.因此，現在您已經確定了會得罪地址。 How do you stop them?你怎麼阻止他們呢？

Here comes the magic mantra which uses iptables (packet) firewall:說到這裡，魔術的口頭禪使用iptables的（包）防火牆：

iptables -A INPUT -s abcd -j DROP iptables的一個投入- abcd - j下降

Replace abcd with the offending IP address.取代abcd與違法的IP地址。 Repeat this for each of the offending IP addresses.重複此為每個違法的IP地址。