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Debian 7: System Administration Best Practices by Rich Pinkall Pollei

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Firewall tools

One thing that the hardening packages do not provide is tools for protecting your systems via firewalls. This absence belies their importance in securing your systems, as a short search of Debian packages will show many tools for building firewalls. They vary from simple to complex, and from command line to full graphic interface. Nearly all are frontends for IPTABLES, the Linux kernel firewall modules and associated commands, and produce appropriate configuration files. Some provide a simple configuration language that is more readable than the standard iptables commands, which the tool then translates into the proper commands for you. Some provide a way of defining firewall policies, which are then translated into proper iptables ...

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