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vulnerable machines, as well as the good traffic that should be allowed through. By playing this traffic in and out of a network security device there can be no doubt about the effectiveness or performance of the Firewall/IDS/IPS. Recent tests of popular security


devices by NSS labs have shown that threats have not been spotted, or evasion has not been detected, simply because the ‘out the box’ configuration had certain functions switched off for performance reasons. A risk analysis will show the


dangers in balancing detection rates with performance. In most cases, unless there is a bandwidth problem, existing devices can be enhanced


and performance maintained or even improved. Fundamentally, you need a way


to make sure that your devices are working as they should. Not just today, but tomorrow and next week. Things will change, and only by regularly auditing and testing the network, by checking that signatures and rules are current and switched on, can you make sure that your network is secure and malicious software hasn’t infiltrated your defences. This voyage of discovery will lead you to fine tune the network and ensure optimal performance that raises your security bar.


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NETCOMMS europe Volume II, Issue 1 2011 29


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