EXPERT RESPONSE
In order to restrict you database connections to a
specific set of IP addresses, you'll need to modify
your database's SQLNET.ORA file. This file is found in
$ORACLE_HOME/network/admin by default. The
TCP.VALIDNODE_CHECKING parameter in this file
determines if the system will check for valid nodes or
not. The TCP.EXCLUDED_NODES parameter specifies which
IP numbers will not be allowed access. The
TCP.INCLUDED_NODES parameter specifies which IP
numbers will be allowed access. You may find it easier
to use the Net Assistant to configure this instead of
manually modifying the file.
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