Disabling remote database access encryption

We've setup an Oracle 9i enterprise db and client on two separate Linux machines in a lab environment. Applying sniffer to the network we see that the client attempts a non-encrypted connection but the db rejects the request and continues with the connection.
Is there any way to disable encryption? Our ultimate goal is to view the contents of SQL/TNS packets for development purposes.
Thanks in advance,
Chris

Thanks for the above pointer! So with the client initiating with 'accepted' and the server returning 'rejected' Table 2-1 describes OAS as being off by default.
The results of a sql log trace are the same as sniffer with samples of the payload below. Is this considered cleartext?
Thanks for all your help.
[04-FEB-2004 17:11:30:124] nspsend: 00 33 00 00 06 00 00 00 |.3......|
[04-FEB-2004 17:11:30:124] nspsend: 00 00 03 54 06 B4 CA 0F |...T....|
[04-FEB-2004 17:11:30:124] nspsend: 08 B8 CA 0F 08 01 00 00 |........|
[04-FEB-2004 17:11:30:124] nspsend: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:30:124] nspsend: 00 00 00 00 00 50 93 FF |.....P..|
[04-FEB-2004 17:11:30:124] nspsend: BF 0A 00 00 00 26 03 D0 |.....&..|
[04-FEB-2004 17:11:30:124] nspsend: EF 1A 40 |..@ |
[04-FEB-2004 17:11:32:054] nsprecv: 01 18 00 00 06 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 10 19 12 BD DC D1 |........|
[04-FEB-2004 17:11:32:054] nsprecv: E8 16 92 55 00 00 78 68 |...U..xh|
[04-FEB-2004 17:11:32:054] nsprecv: 02 04 0B 32 10 7D 04 00 |...2.}..|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 A0 0F 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 01 00 00 00 37 01 01 |.....7..|
[04-FEB-2004 17:11:32:054] nsprecv: 80 00 00 A0 0F 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 1F |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 01 00 A0 0F 00 00 01 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 0B 0B 00 00 00 0B 47 4C |......GL|
[04-FEB-2004 17:11:32:054] nsprecv: 4F 42 41 4C 5F 4E 41 4D |OBAL_NAM|
[04-FEB-2004 17:11:32:054] nsprecv: 45 00 00 00 00 00 00 00 |E.......|
[04-FEB-2004 17:11:32:054] nsprecv: 00 07 00 00 00 07 78 68 |......xh|
[04-FEB-2004 17:11:32:054] nsprecv: 02 04 12 05 3C 06 01 02 |....<...|
[04-FEB-2004 17:11:32:054] nsprecv: 00 01 00 00 00 01 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 FF BF 07 0A 54 45 53 |.....TES|
[04-FEB-2004 17:11:32:054] nsprecv: 54 44 42 2E 43 4F 4D 08 |TDB.COM.|
[04-FEB-2004 17:11:32:054] nsprecv: 05 00 C8 45 14 00 00 00 |...E....|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 01 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 04 01 00 00 00 01 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 01 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 01 00 00 00 03 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 19 00 00 01 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 36 01 00 00 00 00 00 00 |6.......|
[04-FEB-2004 17:11:32:054] nsprecv: 40 AC B1 0A 00 00 00 00 |@.......|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|
[04-FEB-2004 17:11:32:054] nsprecv: 00 00 00 00 00 00 00 00 |........|

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