Oracle Network tracing

a Network Configuration File: /us/oracle/product/10g/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.

NAMES.DIRECTORY_PATH= (TNSNAMES)

#NAMES.DEFAULT_DOMAIN = us.co.uk
#TRACE_LEVEL_CLIENT = SUPPORT
#TRACE_UNIQUE_CLIENT = on
#TRACE_DIRECTORY_CLIENT =/us/oracle/product/10g/network/admin
#TRACE_FILE_CLIENT = sqlnetanuj.log
#TRACE_TIMESTAMP_CLIENT = ON
#TRACE_LEVEL_LISTENER=16
#TRACE_TIMESTAMP_LISTENER=TRUE
#TRACE_DIRECTORY_LISTENER=/us/oracle/product/10g/network/admin
#TRACE_FILELEN_LISTENER=500000
#TRACE_FILENO_LISTENER=10

#TRACE_LEVEL_CLIENT=16
#TRACE_UNIQUE_CLIENT=TRUE
#TRACE_DIRECTORY_CLIENT=/tmp
#TRACE_FILE_CLIENT=client
#TRACE_TIMESTAMP_CLIENT=ON