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Oracle Tips by Burleson

Chapter 7 Oracle Network Security

some parameter files on the server with the following lines.

tcp.validnode_checking = yes
tcp.excluded_nodes = (enrollment1, enrollment2)
tcp.invited_nodes = (claims1, claims2)

The location of these parameters varies from version to version. In Oracle 8i, these are set in a file named protocol.ora; in Oracle 9i, these are set in sqlnet.ora. Both of these files are located in the directory specified by the environmental variable tns_admin, which defaults to $ORACLE_HOME/network/admin in UNIX or %ORACLE_HOME%\network\admin in Windows.

Important: The parameters are set in sqlnet.ora in Oracle9i and protocol.ora in Oracle 8i.

These parameters are intuitively self-explanatory. The first line “tcp.validnode_checking = yes” specifies that the nodes are to be validated before accepting the connection.

The second line specifies that the nodes enrollment1 and enrollment2 are not allowed to connect to the listener. The nodes are indicated either by IP Address (e.g. 192.168.1.100), or the node names as shown above. A single line that is separated by commas specifies the list of node names. The single line is important – you can't break the line.

The third line states that the nodes claims1 and claims2 are allowed. This is important if you specify some node named in the excluded list, but then specify that node as
 

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