DDoS deflate是一款免費的用來防禦和減輕DDoS***的腳本。它通過netstat監測跟蹤創建大量網絡連接的IP地址，在檢測到某個結點超過預設的限制時，該程序會通過APF或IPTABLES禁止或阻擋這些IP.
確認是否受到DDOS***的命令：
netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n執行後，將會顯示服務器上所有的每個IP多少個連接數。
1. 安裝 DDoS deflate .
#彈出版權信息後,鍵入 q , 即可退出版權信息.
2.配置 DDoS deflate .
安裝成功後會提示配置文件在/usr/local/ddos/ddos.conf,所以你可以在ddos.conf裏進行簡要配置.
vi /usr/local/ddos/ddos.conf
##### Paths of the script and other files
PROGDIR="/usr/local/ddos"
PROG="/usr/local/ddos/ddos.sh"
IGNORE_IP_LIST="/usr/local/ddos/ignore.ip.list" //白名單
CRON="/etc/cron.d/ddos.cron"
##### Paths of the script and other files
PROGDIR="/usr/local/ddos"
PROG="/usr/local/ddos/ddos.sh"
IGNORE_IP_LIST="/usr/local/ddos/ignore.ip.list" //白名單
CRON="/etc/cron.d/ddos.cron"
#例行運行項
APF="/etc/apf/apf"
IPT="/sbin/iptables"
----------------------------------------------------------------------------
##### frequency in minutes for running the script
##### Caution: Every time this setting is changed, run the script with --cron
##### option so that the new frequency takes effect
FREQ=1
APF="/etc/apf/apf"
IPT="/sbin/iptables"
----------------------------------------------------------------------------
##### frequency in minutes for running the script
##### Caution: Every time this setting is changed, run the script with --cron
##### option so that the new frequency takes effect
FREQ=1
#ddos.sh執行的頻率,單位是分鐘,搭配crontab來執行.
如果你更改了該設置,請執行 /usr/local/ddos/ddos.sh –cron
如果你更改了該設置,請執行 /usr/local/ddos/ddos.sh –cron
檢測時間，默認爲1分鐘
----------------------------------------------------------------------------
##### How many connections define a bad IP? Indicate that below.
NO_OF_CONNECTIONS=150
#當哪個IP的連接數達到150就加入黑名單；查看連接數你可以執行
#netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
----------------------------------------------------------------------------
##### APF_BAN=1 (Make sure your APF version is atleast 0.96)
##### APF_BAN=0 (Uses iptables for banning ips instead of APF)
APF_BAN=0
#一般情況下你是使用iptables來做防火牆,所以這裏你需要將APF_BAN的值改爲0.
----------------------------------------------------------------------------
##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)
##### KILL=1 (Recommended setting)
KILL=1
----------------------------------------------------------------------------
##### How many connections define a bad IP? Indicate that below.
NO_OF_CONNECTIONS=150
#當哪個IP的連接數達到150就加入黑名單；查看連接數你可以執行
#netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
----------------------------------------------------------------------------
##### APF_BAN=1 (Make sure your APF version is atleast 0.96)
##### APF_BAN=0 (Uses iptables for banning ips instead of APF)
APF_BAN=0
#一般情況下你是使用iptables來做防火牆,所以這裏你需要將APF_BAN的值改爲0.
----------------------------------------------------------------------------
##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)
##### KILL=1 (Recommended setting)
KILL=1
#是否屏蔽IP，將非法的的IP加入iptables的INPUT鏈中,DROP之.
----------------------------------------------------------------------------
##### An email is sent to the following address when an IP is banned.
##### Blank would suppress sending of mails
EMAIL_TO="root"
#給用戶發一封郵件
----------------------------------------------------------------------------
##### An email is sent to the following address when an IP is banned.
##### Blank would suppress sending of mails
EMAIL_TO="root"
#給用戶發一封郵件
----------------------------------------------------------------------------
##### Number of seconds the banned ip should remain in blacklist.
BAN_PERIOD=600
#禁用IP鏈接的的時長
3.卸載 DDoS deflate ,如果你不想用.
wget http://www.inetbase.com/scripts/ddos/uninstall.ddos
chmod 700 uninstall.ddos
./uninstall.ddos
chmod 700 uninstall.ddos
./uninstall.ddos