[Flow-tools] Why the tcp flag is zero?

[lijian]

Hello, everybody.
    I am using the netflow data recently.But I have found a question as follows:
    The tcp flag is always zero no matter what the netflow is. I print the content of netflow with the program flow-print. For about 200,000 real netflow (All of them are tcp flow),there is not one flow with a non-zero tcpflag.
    What is the matter? I use the flow-print and run it as follows:
    ./flow-print -f1< netflowdata

    Does anyone can help me?Thanks very much. 
Best wishes to all




lijian
2007-08-03
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