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 Maintaining Linux Firewalls

"Regardless of the type of firewall you deploy, you will have to test and maintain it carefully.You need to actively monitor your firewall so that you can discover scanning attacks, connection attempts, and general weaknesses. Of course, you will have to scan your firewall to ensure that all extraneous ports and daemons are closed.You can use a scanner such as Nessus (www.nessus.org) to do this. However, even an application such as Nessus cannot implement the specific attacks necessary to truly test your firewall. You may never know that a hacker has entered your network unless you carefully monitor your firewall logs. "
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 (Submitted by Noel Mon May 17, 2004 )

  


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