Install a firewall
The following are popular firewalls to consider that make use of iptables:
We prefer Bastille for Linux because it also helps harden the operating system; however, we've broken out most of
the hardening that Bastille does here,
so you are free to use another iptables-based system.
Also, we've found a great library
of programs that works with iptables to help speed administration time of blocking and unblocking ips and more.
You will most likely have to edit the programs to utilize your firewall rules for the names you use for INPUT,
OUTPUT, etc. in your tables.
IMPORTANT NOTE: This document is based on FreeBSD. The concepts
should be similar across operating systems, but the commands will very likely be different. Also, never
assume the directory structures exist in your system as written in the document. Never blindly follow
security instructions -- read, review, compare, apply as it fits your system.
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