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Linux Firewalls by Michael Rash

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Installing iptables

Because iptables is split into two fundamental components (kernel modules and the userland administration program), installing iptables involves compiling and installing both the Linux kernel and the userland binary. The kernel source code contains many Netfilter subsystems, and the essential packet-filtering capability is enabled by default in the pristine authoritative kernels released on the official Linux Kernel Archives website, http://www.kernel.org.

In some of the earlier 2.6 kernels (and all of the 2.4 kernels), the Netfilter compilation options were not enabled by default. However, because the software provided by the Netfilter Project has achieved a high level of quality over the years, the kernel maintainers felt ...

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