Hi I added a small patch to https://issues.apache.org/jira/browse/OAK-3884 that could fix the broadcast unit tests for UDBBroadcaster. It seems the loopback interface is not allowing broadcasting on *NIX systems. The broadcasting IP has to be found dynamically for a test execution.
Interesting next step: How could this be configured dynamically within a clustered set-up? It needs an agreement among all cluster members to use the same network mask. Cheers, Philipp