Black or White List by IP address SQL NET

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To prevent every one to connect to Oracle database directly, we can just authorize the specified list of IP addresses, for example IP of application servers and legal IPs.

We can just deal with two options in the file SQLNET.ORA Oracle database server side.

$ORACLE_HOME/network/admin/sqlnet.ora

Step 1: Enable the control and the check of the IPs addresses:

tcp.validnode_checking = yes

Step 2: Black list

tcp.excluded_nodes = (172.16.1.122,172.16.1.1)

Note: Authorize any one and just blocks theses two IP addresses.

Step 2: White List

tcp.invited_nodes = (172.16.1.122,172.16.1.1)

Note: Authorize just theses IP addresses and blocks others

Step 3: Reload listener

$ lsnrctl reload

Enjoy !

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