From HowToGeek

iptables is a rule-based firewall for Linux distributions, which will process each rule in order until it finds one that matches. It's installed by default on most varieties of Linux.

Overview

iptables is actually an application that allows you to configure the firewall built into the Linux kernel, which organizes rules into chains, but the term iptables has come to be used to refer to the firewall itself.

The iptables utility can only be used by the root user with su or sudo, and is usually located in the /usr/sbin/iptables directory. You can reference the help file from the man page which can be referenced with the `man iptables` command.

See Also

• Using Iptables on Linux
• Quick Script to Block an IP Address
• Tweaking a Dedicated Virtual Web Server

List of Linux Components v
Features	Samba
Applications	gedit vim
Security	iptables