When you install Oracle 11.2.0.3 on RHEL6 and VMware you might face multicast test fails in Prerequisite Checks step in Grid Infrastructure installation and in Database software installation.
These fails comes because cluvfy is running prerequisite tests for all ports and if your firewall is not allowing all of them then it gives those fails. But you can download mcasttest.pl script from MOS (My Oracle Support). Search it on the MOS with the script name. Correct MOS document is ". This document gives also hints how to run the script. Document speaks about 11.2.0.2 version but you can use same script with 11.2.0.3 version checking. This script can be used to test multicast with the correct ports and if it goes throught then you can safely ignore multicast fails in prerequisite check.
for example:
perl mcasttest.pl -n node1_name,node2_name -i eth1
If you want to test your firewall settings after installation you can run cluvfy check from command line this way (as oracle user):
/app00/app/11.2.0/grid/bin/cluvfy stage -post hwos -n node1_name,node2_name -verbose
Multicast check lines can be find end of the log file just like in the installation logs (grep Checking multicast communication )
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