By Charles Riley (Editor), Visit Amazon's Umer Khan Page, search results, Learn about Author Central, Umer Khan, , Michael Sweeney
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Extra info for Cisco PIX Firewalls: Configure, Manage, & Troubleshoot
Pdf (800-40 is the document number). qxd 5/6/05 12:40 PM Page 13 Introduction to Security and Firewalls • Chapter 1 might improve security—for example, by deploying additional firewalls internally or on your network perimeter. Monitoring Activity As you make efforts to secure your environment, you move into the next phase of information security: establishing better mechanisms for monitoring activity on your network and systems. Adequate monitoring is essential so that you can be alerted, for example, when a security breach has occurred, when internal users are trying to exceed their authority, or when hardware or software failures are having an impact on system availability.
However, firewalls are just one component in an enterprise security strategy. They are generally good at what they do (filtering traffic), but they cannot do everything. The nature of perimeter security has also changed; many companies no longer need outbound-only traffic. Many enterprises now deal with much more complex environments that include business partner connections, VPNs, and complicated e-commerce infrastructures. This complexity has driven huge increases in firewall functionality. 323 for videoconferencing.
By renumbering their private networks with these reserved address ranges, companies could potentially return their allocated public blocks for use elsewhere, thus extending the useful life of IP v4. The sharp reader, however, will point out that if these addresses are not routable on the Internet, how does one on a private network access the Web? This is where Network Address Translation (NAT), defined in RFC 1631, comes into play. This serves as a basic security measure that can make it a bit more difficult for an external attacker to map out the internal network.