improve ipfw rules

[twig les]

> BTW, does anyone know if snortsam work with ipfw?
> /Dorin.
> 

It's in the experimental stage but the noise sounds promising. 
I can't seem to find the email thread that discusses it though...grrr.

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With a few exceptions, secrecy is deeply incompatible with
democracy and with science.
     --Carl Sagan  
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