We all know that the internet works by sending and receiving small chunks of data called packets. Back in the early days, when the internet was still in its infancy, packets were allowed to transfer freely across a connected world, however small that world was. Anyone could send packets to your system, and you could send packets to other connected systems. All services running on systems were exposed by default.
As the internet started to grow, problems started to emerge, problems related to security. There are worms, viruses, unauthorized access, denial-of-service (DoS) attacks, IP spoofing, etc. Iptables is an attempt to deal with some of these problems.
This article has been indexed from DZone Security Zone
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