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If you have two pix firewall's you would configure failover. It works a lot like HSRP, but uses only two addresses instead of three. Configure the IP address on the primary active pix. In the config, another command will state "failover ip address". ...
The pix is really a layer 4 filtering device, meaning anything that follows the rules you set up as far as what port you are using will be allowed to pass through. Virus' such as Nimba would pass through your firewall because it works on port 80. It ...
