[Oisf-users] real time alert on tcp stream and flowint

Nikolay Denev ndenev at gmail.com
Thu Feb 9 20:03:12 UTC 2012

Hi all,

It's probably stupid question and I'm missing something but I don't seem to be able
to generate alert immediately when for example a given string is found inside a TCP stream.
When the TCP connection closes, suricata immediately prints the alert in fast.log.
How can I make the alert be generated immediately when the rule condition is matched?

Also I don't know if its because of this I don't seem to be able to trigger the rule to match several times on the same stream, 
while I have the string that should fire the alert several times in the stream. 

Here's an example :

alert tcp $HOME_NET 6666 -> any any \
        (msg:"got one"; content:"something"; flowint:something,notset; flowint:something,=,1; sid:10;)

alert tcp $HOME_NET 6666 -> any any \
        (msg:"got five or more"; content:"something"; flowint:something,isset; flowint:something,+,1; flowint:something,>,5; sid:11;)

This never works, I just have the first rule fire once when the TCP session is terminated.

P.S.: As a side note the wiki should be updated to include probably "sid"s for the rules, as currently when I try to run the examples
suricata complains about duplicated rules.


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