Last updated on AUGUST 19, 2017
Applies to:Oracle Net Services - Version 220.127.116.11 to 18.104.22.168 [Release 11.2 to 12.1]
Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [Release 11.2 to 12.1]
Information in this document applies to any platform.
Starting with 188.8.131.52 we have the option of using VNCR to protect the listener from having remote/unknown instances registering to it.
See <Note 1600630.1> Valid Node Checking For Registration (VNCR)
On 12.1 RAC databases, the parameter VALID_NODE_CHECKING_REGISTRATION_listener_name for both local and scan listeners is set by default to SUBNET/2 i.e. all machines in the subnet are allowed registration. This is done in order to allow registration to the local listeners and scan listeners from the instances on the other nodes of the RAC.
On 184.108.40.206 RAC databases, the parameter VALID_NODE_CHECKING_REGISTRATION_listener_name is set to off.
However, sometimes this allows other instances in the same subnet to register against these listeners. We want to prevent that and allow only local instances to that RAC database to be regsitered with these listeners.
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