Linux Security Tools
Linux security information is readily found at a number of Linux-related sites. The first to check, and stay abreast of, is always the distribution vendor's site. Its pages usually provide an overview of Linux-related security issues with links to other relevant pages. You should also keep abreast of issues and problems posted at www.cert.org and www.linuxsecurity.com.
You can also find information on any Linux command through a number of utilities inherent in Linux:
The man tool offers pages on each utility. For example, to find information about the setfacl tool, you can type man setfacl.
Most utilities have the built-in option of --help to offer information. From the command line, you can type setfacl --help to see a quick list of available options.
The info utility shows the man pages as well.
The whatis utility can show if there is more than one set of documentation on the system for the utility.
The whereis utility lists all the information it can find about locations associated with a file.
The apropos utility uses the whatis database to find values and returns the short summary information.
Every network, regardless of size, should utilize a firewall. On a home-based network, a personal software firewall can be implemented to provide protection against attacks.