Comms between a database and an oracle client is slow

I have a Win2000 server machine (Running MicroStrategy) with Oracle client (9.2.0.1.0) querying an Oracle DB (9.2.0.6.0) on AIX 5.2 (They are connected via Gbit ethernet, ping times are 1ms and no hops enroute). After a lot of testing I have simulated the problem I see in MicroStrategy by running a simple select * from A_TABLE which returns 30,000 rows to the client. When I run this it takes about 2 minutes to complete.
When I run the same query against a copy of the database on Solaris it takes 5 seconds.
When I run the same query from a different PC (same Oracle client) it takes 2 seconds.
I seem to have a problem with this specific Oracle client machine talking to a specific Oracle DB. It happens with Oracle Net connections, ODBC and Oracle Wire Protocol connections.
Anyone have any ideas?
Thanks
Marc

I can't see how tuning the Oracle Networking would help as both ends of this problem work OK when talking to other nodes. The DB server certainly performs well with any other client, so tuning at that end would seem pointless. The Win2000 server first display the issue using Oracle Wire Protocoal drivers which don't require Oracle client anyway - there doesn't seem to be much to tune. (AND it works OK against other DBs)

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