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How can I determine the network throughput of a firewall to ensure it will handle my customer's network traffic?

07 Nov 2007 | SearchSecurityChannel.com

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About the author
Chris Clements is a security architect for Flat Earth Networking Inc., a dedicated information security company based in Nashville, Tenn. Chris has expertise in numerous security systems, security policy, vulnerability assessment and business case analysis. In January of 2007, Chris was launched a consulting offering including research, design, auditing and education for the Fortune 1000 customer market.

Rating firewalls by network throughput is kind of like estimating the number of gumballs you can put in a jar. The answer depends on the size of the gumball. Network firewalls process and make security decisions on individual network packets. This means the most accurate rating of a network firewall would be packets per second. The problem is that not many organizations know how many packets per second they need, but do know the throughput (megabits per second) of their network connections. Because packets can vary between large or small chunks of data, you can fit many more small packets into a given container (bandwidth measurement) than large packets. This can lead to a large disparity between the vendor rating and the firewall's actual performance.

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