> solution, right?) and so they are very difficult to crack. Could you
> please elaborate on that.

Sure can.  I left out a word in that sentence.  I meant to say:

"Machines that are used as a packet filtering firewall often fall into 
this category."                                                             ^^^^^

I say that because often times, at least in my experience, a packet 
filtering firewall is configured with no services running so that they 
become very difficult to attack.

Steve Bremer


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