frag3 configuration

[hchlai () netscape net (Hin)]

I'm running Snort 2.4.0 as a NIDS in front of a firewall (which also do NAT for my internal machines). Now, I run into 
a problem when I try to define the frag3_engine preprocessor. It seems the benefits to use frag3 is to turn your IDS 
into a "target-based IDS" by knowing what machines you are protecting (in this case, the type of OS), but I am managing 
a huge class B network which is almost impossible to bind IP address to policy type or different OS. I have different 
OS running everywhere in my network. What's the recommendation out there?
 
**Note: Due to the network architecture, I'm not able to put up a sensor at each network segment.  

Many thanks!

Hin

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