Depends on the product. You probably want a log Capture, Formatting
and Analyzer app.
HERE is a great listing at security-Forums of various FW Log Analyzers
Most important IMO is to know when it was changed and what was done.
Best to you and Happy New Year,
Mongrel
EDIT
Did you check out the free 21 day trial of SolarWinds IPMonitor available
to members here?
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