Finding IP of clients connected to a particular server

Hi,
How can we trace the IP of a client connected to the server and based on that deny access to a particular IP address?

Did you really read the link? The query that is given there needs to be in a login trigger so the IP address is visible for each session in v$session.
Yes, of course, if you just run that query at a SQL*Plus prompt, it will show you your IP address - that is the point.
Once you can see the IP address in v$session, you can deny access to a specific IP in the login trigger.

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