ref:(D)DoS Deflate,禁用ip,block ip,linux

--note cole
I can install sshclient at server side and add server ip to ignore.ip.list
in this way I won't lose control of the server and whenever my local computer ip changes it won't impact my access to the server, I just prepare two plan sshclient on local pc, the other on server side.
--
in ddos.conf set connection to 1 mean block every ip connection except IPs in ignore list.

http://forums.deftechgroup.com/showthread.php?t=825&page=4

About

(D)DoS Deflate is a lightweight bash shell script designed to assist in the process of blocking a denial of service attack. It utilizes the command below to create a list of IP addresses connected to the server, along with their total number of connections. It is one of the simplest and easiest to install solutions at the software level.

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

IP addresses with over a pre-configured number of connections are automatically blocked in the server's firewall, which can be direct iptables or Advanced Policy Firewall (APF). (We highly recommend that you use APF on your server in general, but deflate will work without it.)

Notable Features

• It is possible to whitelist IP addresses, via /usr/local/ddos/ignore.ip.list.
• Simple configuration file: /usr/local/ddos/ddos.conf
• IP addresses are automatically unblocked after a preconfigured time limit (default: 600 seconds)
• The script can run at a chosen frequency via the configuration file (default: 1 minute)
• You can receive email alerts when IP addresses are blocked.

Installation

wget http://www.inetbase.com/scripts/ddos/install.sh
chmod 0700 install.sh
./install.sh

Uninstallation

wget http://www.inetbase.com/scripts/ddos/uninstall.ddos
chmod 0700 uninstall.ddos
./uninstall.ddos

Questions?

Although most things are explained on this page, if you have any further questions, you may contact the original developer of the script, Zaf.