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→Investigation 8: How do I view and configure the IPTABLES firewall? -- Basic Function/Configuration
{{Admon/note | Use the f17host c6host | Complete the following steps on your '''f17hostc6host''' computer systemmachine.}}
{{Admon/note | | [http://en.wikipedia.org/wiki/Iptables Iptables] is the built-in firewall for LINUX. While this program can be controlled by different GUI'sGUIs, we are going to investigate the powerful command line interface for this program to choose what data is allowed into, out of and through our computer.
Essentially, Iptables is a list of rules. Each rule is placed into a particular chain and when data is sent into, out of or through a PC the data is checked against these rules. If the data matches a particular rule, it then must “jump” to a condition. Simple conditions include ACCEPT, DROP and LOG but there are also more complex conditions that can be applied and there is even the option to create your own conditions.