CentOS下iptables封IP的命令讲解时间:2021-07-31 05:42:42 查看当天登陆未成功的IP 一条命令把这些IP全部封掉: for i in `grep "$(date +"%b %d")" /var/log/secure | grep "Failed password" | awk '{print $(NF-3)}' | sort | uniq -c | sort -nr| awk '{print $2}'` ;do iptables -A INPUT -s $i -j DROP; done 效果: