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Oracle 10g Improved Connection Manager Access Rules

This feature is used to ease configuration and provides more flexibility when specifying access rules for the Connection Manager (CMAN) process. Rules are used to filter traffic for CMAN based on timeout, subnet mask, idle timeout, and other rule-level controls.

You can use the parameter rule_list in a CMAN configuration file to control client access to specific database servers in a TCP/IP network,.

By entering your specific filtering rules under this parameter, you can allow or restrict specific clients from accessing a database server. To configure access control using the rule_list parameter, follow this general procedure:

  1. Check to see whether a cman.ora file exists in your $ORACLE_HOME/network/admin (on UNIX/Linux) or its equivalent location. If one doesn’t already exist, manually create one. A sample cman.ora file looks like this:

CMAN=
(CONFIGURATION=
(ADDRESS=(PROTOCOL=tcp)(HOST=test)(PORT=1521))
(RULE_LIST=(
(RULE=(SRC=206.62.226.32/27)(DST=test-server)(SRV=*)(ACT=accept))(ACTION_LIST=(AUT=on)(MCT=120)(MIT=30))))
(PARAMETER_LIST=(
(MAX_GATEWAY_PROCESSES=8)
(MIN_GATEWAY_PROCESSSES=3)
(REMOTE_ADMIN=YES)))

  1. In the cman.ora file, if it isn’t already there, add the parameter rule_list and its subparameters, using the following general format:

(RULE_LIST=
(RULE=(SRC= source_host)
(DST= destination_host)
(SRV= service)
(ACT=accept | reject | drop))))

  1. Add the following parameters for each rule. (Note: you can define multiple rules in the rule_list. The action (ACT) in the first matched rule is applied to the connection request. If no rules are defined, all connections are rejected.)

  • src  – This parameter specifies the source host name or IP address of the client. The IP address is allowed to be a subnet, such as 152.10.10.62/24.


Get the complete story:

The above text is an excerpt from "Oracle Database 10g New Features: Reference for Advanced Tuning and Administration", by Rampant TechPress.  Written by top Oracle experts, this book has a complete online code deport with ready to use scripts. 

To get the code instantly, click here:

http://rampant-books.com/book_2003_2_oracle10g.htm


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