3.6.1 Ensure iptables is installed (Scored)

Level 1 - Server
Level 1 - Workstation 

iptables allows configuration of the IPv4 tables in the linux kernel and the rules stored within them. Most firewall configuration utilities operate as a front end to iptables.

iptables is required for firewall management and configuration.

Run the following command and verify iptables is installed:

# dpkg -s iptables

Run the following command to install iptables:

# apt-get install iptables