services.cassandra.rpcAddress

The address or interface to bind the native transport server to.

Set rpcAddress OR rpcInterface, not both.

Leaving rpcAddress blank has the same effect as on listenAddress (i.e. it will be based on the configured hostname of the node).

Note that unlike listenAddress, you can specify "0.0.0.0", but you must also set extraConfig.broadcast_rpc_address to a value other than "0.0.0.0".

For security reasons, you should not expose this port to the internet. Firewall it if needed.