RAC instabilities due to firewall (netfilter/iptables) enabled on the cluster interconnect (Doc ID 554781.1)

Last updated on JUNE 13, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 04-Aug-2010***


Symptoms

Oracle Clusterware may not startup (root.sh on second node fails with "Failure at final check of Oracle CRS stack."), due to a firewall (such as iptables on Linux) configured on the cluster interconnect. Other symptoms include moderate to serious performance and stability issues, directly related to such firewalls. Examples are false evictions of nodes, 'IPC SEND/RECEIVE TIMEOUT' and slow/uneven performance.

Cause

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