Multicast Requirements for Networks Used by Oracle Grid Infrastructure
For each cluster member node, the Oracle mDNS daemon uses multicasting on all interfaces to communicate with other nodes in the cluster.
Multicast Requirements for Networks Used by Oracle Grid Infrastructure
Multicasting is required on the private interconnect. For this reason, at a minimum, you must enable multicasting for the cluster:
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Across the broadcast domain as defined for the private interconnect
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On the IP address subnet ranges 224.0.0.0/24 and optionally 230.0.1.0/24
You do not need to enable multicast communications across routers.