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Oracle 10g Improved Network Outage Detection

sqlnet.inbound_connect_timeout – This parameter is used to limit the time, set in seconds, for a client to connect with the database server and provide the required authentication information.

As we have all seen with recent worm and virus attacks, unauthorized access to a system service such as the Listener or database server can result in denial-of-service attacks. In a denial-of-service attack, an unauthorized client attempts to block the authorized users’ ability to access the system. Malicious clients or hackers may attempt to flood the Listener or database server with bogus connect requests solely to consume resources, such as connections, processes, or threads.

To minimize the effect of denial-of-service attacks, you should configure limits that constrain the time in which resources can be held prior to authentication. In this way, client attempts to exceed the configured limits will result in connection terminations and an audit trail containing the IP address of the client being logged.

To limit consumption of Oracle 10g’s resources by unauthorized users and enable an audit trail, you should set time-limit values for the sqlnet.inbound_connect_timeout parameter described previously. (This parameter does not have default values.)

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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. 

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