Oracle TNS

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Hi,

  I am a beginner in Oracle. I would like to monitor Oracle network 
packets. However, I cannot find any documentation describing TNS 
protocol format. Is this a proprietary protocol? I am a bit confused 
when I google the net.

/TNS stands for Transparent Network Substrate (TNS). This is a non- 
proprietary low-level interface that manages the opening and closing of 
sessions and the sending or receiving of requests.

/
Sample Chapter from Professional ASP Data Access

My questions are:

1.So is it proprietary or not?
2.Is there any documentation describing the protocol format?
3.If no documentation, is studying the source code on ethereal tns 
dissector the only choice?

Many thanks
Joe

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