[Bro] getting first results

Greg Kosinovsky kosinovsky1 at llnl.gov
Tue Jul 28 11:11:43 PDT 2009

I am trying to get my first results with BRO. I am just running 
mt.bro on an existing tcpdump file (containing some DNS data). My 
exact command is "bin/bro -r dns.cap share/bro/mt.bro"

This command run to completion without error and creates empty log 
files for a number of policies loaded inside mt.bro. Also, if I put a 
print statement inside mt.bro, I can see the output. However, If I 
put print statements inside any of the functions defined in policies 
loaded by mt.bro ("dns-lookup", "weird", etc.,) I cannot see any 
results -- presumably these policies have to be invoked. The scripts 
I am modifying to try to see these results are in share/bro 
(share/bro/weird.bro, share/bro/dns-lookup.bro, etc.).

It appears to be straightforward, but I must be missing something conceptually.

Thank you,


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