DDoS deflate - Linux下防御/减轻DDOS攻击

DDoS deflate是一款免费的用来防御和减轻DDoS攻击的脚本。它通过netstat监测跟踪创建大量网络连接的IP地址,在检测到某个结点超过预设的限 制时,该程序会通过APF或IPTABLES禁止或阻挡这些IP.

如何确认是否受到DDOS攻击?

执行:

netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n


1、安装DDoS deflate

wget http://www.inetbase.com/scripts/ddos/install.sh  //下载DDoS  deflate

chmod 0700 install.sh    //添加权限

./install.sh            //执行

卸载Ddos




2、配置DDoS deflate

5 CRON="/etc/cron.d/ddos.cron"

  6 APF="/etc/apf/apf"

  7 IPT="/sbin/iptables"

  8

  9 ##### frequency in minutes for running the script

10 ##### Caution: Every time this setting is changed, run the script with --cron

11 #####          option so that the new frequency takes effect

12 FREQ=1 #//检查时间间隔,默认1分钟

13

14 ##### How many connections define a bad IP? Indicate that below.

15 NO_OF_CONNECTIONS=150  #//最大连接数,超过这个数IP就会被屏蔽,一般默认即可

16

17 ##### APF_BAN=1 (Make sure your APF version is atleast 0.96)

18 ##### APF_BAN=0 (Uses iptables for banning ips instead of APF)

19 APF_BAN=0 #//使用APF还是iptables。推荐使用iptables,将APF_BAN的值改为0即可。

20

21 ##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)

22 ##### KILL=1 (Recommended setting)

23 KILL=1  #//是否屏蔽IP,默认即可

24

25 ##### An email is sent to the following address when an IP is banned.

26 ##### Blank would suppress sending of mails

27 EMAIL_TO="root"  #//当IP被屏蔽时给指定邮箱发送邮件,推荐使用,换成自己的邮箱即

    可

28

29 ##### Number of seconds the banned ip should remain in blacklist.

30 BAN_PERIOD=600  #//禁用IP时间,默认600秒,可根据情况调整


查看/usr/local/ddos/ddos.sh文件的第117行

netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -nr > $BAD_IP_LIST

修改为以下代码即可!

netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sed -n ‘/[0-9]/p’ | sort | uniq -c | sort -nr > $BAD_IP_LIST

测试

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