preprocessor arpspoof, help!

[Daniel Ascensão <dpla () mega ist utl pt>]

Hi,

I'm trying to use the arpspoof preprocessor but I have some questions.
First where can I find some documentation about it?

I’m not sure how does it work, I have this conf. In the arpspoof:
preprocessor arpspoof
preprocessor arpspoof_detect_host: 10.0.99.153 0:30:84:ee:c4:34
preprocessor arpspoof_detect_host: 10.0.255.254 0:30:48:12:66:81

if I get any arp package that match this mapping I get the following log:

[**] [112:4:1] (spp_arpspoof) Attempted ARP cache overwrite attack [**]
02/14-16:41:14.553565

And if the arp request or reply doesn’t match it’s dropped silently. 
However, what I want to do with the preprocessor is to have an alert when I 
have arp request that didn’t match the mapping and possibly drop it.

Another question, this “alerts” don’t appear in SnortSnarf reports, why?

Thks in advance

Daniel Ascensão 



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