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Linux Firewalls by Michael Rash

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Concluding Thoughts

The Snort community has lit the path toward an effective language for detecting network attacks, and so it is logical for fwsnort to use the Snort signature set as its source of attack descriptions. But, iptables is a firewall, and firewalls are all about control. Consider the scenario where a vulnerability is found within a piece of mission-critical server software that you are running on a Linux system. Until an outage window can be scheduled for this server to be patched, the system is vulnerable to attack. By leveraging the power of the Snort community, once a signature is developed and released, fwsnort can tell your Linux kernel how to discard packets that appear to exploit the vulnerability before they can do any real ...

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