Concluding Thoughts
This chapter focuses on iptables concepts that are important for the rest of the book and lays a foundation from which to begin discussing intrusion detection and response from an iptables standpoint. We are now armed with a default iptables policy and network diagram that is referenced in several upcoming chapters, and we have seen examples of iptables log messages that illustrate the completeness of the iptables logging format. We are now ready to jump into a treatment of attacks that we can detect—and thwart, as we shall see—with iptables.
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