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Hardening Cisco Routers (O'Reilly Networking)
Published: February, 2002
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To harden a router is to render it more heavily defended and more difficult to attack. Because routers (by definition) serve as points of entry into your network, it makes sense to devote extra effort to their security. Hardening Cisco Routers
shows how to make adjustments to the configurations of routers from Cisco Systems to improve their resistance to attack, particularly external attack. This is essentially a book of specialized Internetwork Operating System (IOS) commands, as well as
explanations of their behavior. It'll appeal to the router administrator--employed either by an organization's internal network staff, an outside consultancy, or a service provider--who wants to know which IOS commands he or she should add to routers'
configuration files to tighten their security without a lot of hassle.
The great thing about this book is that you can approach it in either of two ways. If you just want to clamp down on your routers' security weaknesses as soon as possible, you
can begin with the checklists at the end of each chapter (each of which focuses on a particular area, like SMTP) or the big one in an appendix, which is comprehensive. These checklists include both "how" and "why" information, as exemplified by "Disable
ICMP broadcasts with the no ip directed-broadcast command." If you want more information on the big picture, or want to prepare for a specific kind of attack, read the individual chapters for detailed advice on how to set IOS to behave as you want.
Topics covered: Internetwork Operating System (IOS) commands you can use to protect Cisco Systems routers from a variety of attacks. Specialized sections deal with security assessment, auditing, access control, privileges, optional
services, and the legal importance of your login banners' contents.
As a network administrator, auditor or architect, you know the importance of securing your network and finding security solutions you can implement quickly.
This succinct book departs from other security literature by focusing exclusively on ways to secure Cisco routers, rather than the entire network. The rational is simple: If the router protecting a network is exposed to hackers, then so is the network
behind it. Hardening Cisco Routers is a reference for protecting the protectors. Written by Thomas Akin, an experienced Certified Information Systems Security Professional (CISSP) and Certified Cisco Academic Instructor (CCAI), the book emphasizes
practicality and a hands-on approach. At the end of each chapter, Akin includes a Checklist that helps you double-check the configurations you have been instructed to make. They serve as quick references for future security procedures. Concise and to
the point, Hardening Cisco Routers supplies you with all the tools necessary to turn a potential vulnerability into a strength.
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