Snort - the de facto standard for intrusion detection/prevention
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Format

flow: [(established|stateless)] 
      [,(to_client|to_server|from_client|from_server)]
      [,(no_stream|only_stream)]
Figure: Flow usage examples
\begin{figure}\begin{verbatim}alert tcp !$HOME_NET any -> $HOME_NET 21 (msg:''...
...sg: ''Port 0 TCP traffic''; \
flow:stateless;)\end{verbatim}
\par\end{figure}



Steven Sturges 2006-12-08