Monitoring Port 1521

We have an application that makes use of port 1521 for an oracle 
listener.  The port is totally blocked outside of a domain and so the 
security level is set to 'request' for encryption.

But now there is a need for a system outside of the domain to have access 
via an oracle listener.  But in this case we need to insure that all 
traffic is encrypted.

Our DBA (hey, I'm the poor support person) worked with Oracle to try to set 
up a second listener on another  port with the security level set to 
'encrypt'.  Oracle and the DBA worked may hours attempting this, but found 
they could not get multiple listeners at different security levels working 
(anyone successful at this?).

Drop to Plan B.  Set up a second listener (same security level) on another 
port and open that port to the other system.  Now the only problem is to 
ensure that all traffic is encrypted.  We have a 'promise' from the other 
system that it will always encrypt requests.

To ensure that we are doing due diligence how can one monitor and recognize 
that the traffic is actually encrypted?  If we find that it isn't then we 
want to re-enable our firewall to block them.

Suggestions? Solutions? Help!

Dan

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