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Packets need not traverse every chain in the NetFilter system. It all depends on the destination of the packet as well as what rules are applicable and whether NAT is involved.
Although the configuration of NetFilter firewalls using the iptables utility may appear to be a daunting task, you can also configure NetFilter through a variety of graphical interface tools such as Firewall Builder, Firestarter, or Webmin. Some examples to follow show how you can configure NetFilter using the iptables utilities as well as these graphical tools. This discussion is not meant to be a detailed method of how to use these tools but rather a brief introduction to these tools. You must further explore and decide which tool you are most comfortable using to manage Linux-based firewalls.
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