Enhancing Linux Networking With Layered Security Techniques

If you want to leave certain nice to do's or ease of use functionality available to your self such as leaving SSH open only to root or having a machine with anonymous FTP access available, then take a slightly different approach to securing your environment (or those particular machines): layered security. Without changing the physical layout of your network, change the network layout using iptables and/or tcp wrappers.

This is essentially saying that all traffic that you want to funnel to Server II or Server III will now go through server I. This can be used in a variety of ways. Let

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