修改Linux SSH连接端口和禁用IP，安装DDoS deflate

修改连接端口

修改配置文件

vi /etc/ssh/sshd_config

port your_port_num

重启SSH配置

service sshd restart

重新连接VPS并删除默认22端口

port 22

禁用IP

iptables -I INPUT -s 0.0.0.0 -j DROP

iptables -I INPUT -s 61.177.172.10 -j DROP
iptables -I INPUT -s 58.218.198.167 -j DROP
iptables -I INPUT -s 122.172.137.116 -j DROP

安装DDoS deflate

DDoS deflate介绍

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

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

配置DDoS deflate

##### 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"  //IP地址白名单
CRON="/etc/cron.d/ddos.cron"    //定时执行程序
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   //检查时间间隔，默认1分钟

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

##### 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=1        //使用APF还是iptables。推荐使用iptables,将APF_BAN的值改为0即可。

##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)
##### KILL=1 (Recommended setting)
KILL=1   //是否屏蔽IP，默认即可

##### An email is sent to the following address when an IP is banned.
##### Blank would suppress sending of mails
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

##### Number of seconds the banned ip should remain in blacklist.
BAN_PERIOD=600    //禁用IP时间，默认600秒，可根据情况调整

reboot

参考文章