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Cisco ASA and PIX Firewall Handbook by Dave Hucaby

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10-1. Checking Firewall Vital Signs

After a firewall is put into production, it is important to know how to check its health. You can proactively monitor various resources and statistics in an effort to determine when the firewall has a problem or becomes underpowered. As well, when users complain of problems or slow response times, you should be able to look into some of the firewall's inner workings to quickly spot issues.

How a firewall will behave under the load of a production network with real users and real appli-cations is difficult to predict. When a problem is reported, you can rely on many of the available firewall statistics to see what is wrong. However, those numbers don't mean much if you don't have anything to compare them against. ...

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