Intrusion detection and firewall validation

I am looking for software or a method to test my firewall setup against various attacks, as well as a log parser that will alert me when things get fishy.  Something visual is preferred but not required.  My firewall is running on an embedded distribution of linux, with a reasonably recent version of iptables.  Remote logging and parsing is available on a full linux box.
GoTravelAsked:
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nisapusConnect With a Mentor Commented:
To test your firewall, please try
 - nessus  (http://www.nessus.org/nessus/) easy to use
 - nmap (http://nmap.org/)

For intrusion detection, please try
 - Snort (http://www.snort.org/)
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