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Network Security Firewalls
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securing Oracle tnslistener on firewall.

from [mjohn2000_99] Network Security [Permanent Link]
Subject: securing Oracle tnslistener on firewall.
Date: 6 Dec 2005 16:03:01 -0000 
Hello friends,
My oracle people tell me to open up all TCP high ports to allow SQL 
communication. I see a security issue there because it would open up about 60K 
ports. 

My test shows that the only port used by TNS listener is 1521. But, oracle 
people claim that when there is need for many connections, oracle would spawn 
more dedicated process for each connection and redirect connections to random 
high ports. My research showed that claim is correct. But, it is a risky thing 
to open up too many ports. 

Please advise me how I can make the SQL communication secure. If u know any 
article explain the security, please point me on that direction.

Thank you?.
John
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