When designing Internet defenses, administrators and security practitioners frequently overlook easy, inexpensive means of providing “Defense in Depth.” One of these methods is taking advantage of the security features built into the Cisco Internetwork Operating System (IOS). Cisco routers are quite prevalent in the market today, and many organizations use them for Internet access. Although the author’s familiarity with Cisco equipment will be the focus of this paper, the same techniques can also be applied to equipment from other vendors.
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