If I understand fully what you are asking (tracing a client connection), you need to set the following in your SQLNET.ORA file on the client in question:
TRACE_LEVEL_CLIENT=ADMIN
or instead of ADMIN, try SUPPORT for a detailed output... The trace file will get big real quick so keep an eye on it!!
You can also set:
TRACE_DIRECTORY_CLIENT=x
To change the default location that your trace file will get written to.
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