How to enhance the firewall of Linux by using TDS and BFD

This article mainly describes how to use TDS and BFD to enhance the Linux firewall. BFD: brute-force cracking Detection), as well as the TDS advanced rule firewall, are all Linux security tools developed by Rf-x Networks.
Before installing BFD, make sure that you have installed the TDS agent, because BDF uses some of the features and features of the TDS agent. If you have not installed the TDS agent, click here to read the installation and configuration of the TDS agent.
Download the latest BFD: wget http://www.rfxnetworks.com/downloads/bfd-current.tar.gz
Decompress the package and switch to the directory:

Tar-xzvf bfd-current.tar.gzcd bfd-version

Installation:

./install.sh

After the installation, configure BFD:

nano /usr/local/bfd/conf.bfd

Change ALERT_USR = "0" to ALERT_USR = "1 ″.
Change EMAIL_USR = "root" to EMAIL_USR = "your Email address ".
Save and exit.
Add your own IP address to the Trust List:

nano -w /usr/local/bfd/ignore.hosts

One line of each IP address. If your IP address is changed, for example, the change range is 111.111.1.1-111.111.255.254, you only need to enter 111.111. OK. Now you can start BFD!

/usr/local/sbin/bfd -s

If you are familiar with shell programming, you can even configure the software in/usr/local/bfd/rules ).
After BFD is installed, a task automatically runs every 8 minutes is added to/etc/cron. d/bfd. Thanks to Rf-x Networks for providing us with excellent security tools. We wish you a smooth installation and usage!

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