Re: analyse tcpdump output

[Jason Chambers <jchambers () ucla edu>]

On Nov 22, 2006, at 7:34 AM, Stefan Hegger wrote:
> Hi,
>
> I wonder if someone knows a tool to use a tcpdump output for anomaly
> dedection. It is sometimes really time consuming when looking for  
> identical
> patterns in the tcpdump output.


SiLK is a powerful toolset for analyzing netflow and pcap data  
generated from TCPDUMP.  It's a slight learning curve, but worth it  
IMHO.  Fairly good documentation too.

        http://tools.netsa.cert.org/silk/silk_docs.html
        http://tools.netsa.cert.org/silk/analysis-handbook.pdf


From that toolset, you can use "rwptoflow" to generate flow records  
from TCPDUMP to SiLK format.

        http://tools.netsa.cert.org/silk/rwptoflow.html

You might also look at "softflowd" [1] or similar tool to export  
netflow records from whatever box your using TCPDUMP to capture  
data.  Then you can output netflow records directly to most of the  
aforementioned netflow packages.  Having the actual packet data is  
useful later once you've found something suspicious, or for snort.. etc.

[1] http://www.mindrot.org/projects/softflowd/

--Jason