ubuntu 安装CSF防火墙

1. 安装Login as the root user to SSH and run the following commands.rm -fv csf.tgzwget http://www.configserver.com/free/csf.tgzapt-get install libwww-perl?tar -xzf csf.tgzcd csfsh install.sh2. 防范DDOS攻击Step 1 :  Open the CSF configuration file /etc/csf/csf.conf

Step 2 : In that search for option called CT_LIMIT, by default it will be like CT_LIMIT=0 , change this to CT_LIMIT=90 ,here 90 is the max no.of connections from an IP to your server ( choose this value according to your server usage )

Step 3:Now search for option called CT_PORTS.This option is used to specify the port for which you want prevent DOS attack.Since our aim is to prevent the DOS attck to apache port 80 , change CT_PORTS = “” to CT_PORTS = “80″

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3. 限制每个IP连接数

CONNLIMIT = "80;7"

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4. PT_LIMIT = "0" 禁止程序内存不足时，发邮件