Chapter 5. Preparations
This chapter is aimed at getting you started and to help you understand
the role Netfilter and iptables play in Linux today.
This chapter should hopefully get you set up and finished to go with your
experimentation, and installation of your firewall. Given time and
perseverance, you'll then get it to perform exactly as you want it to.
The iptables user-space package can be
downloaded from the https://www.netfilter.org/. The iptables
package also makes use of kernel space facilities which can be configured
into the kernel during make configure. The necessary
steps will be discussed a bit further down in this document.