Please change present behavior.
We need to define only one property -Dmcast (for ex., the name doesn't matter now) as command line parameter - this multicast address is needed to be distributed to every subsystem which manages any multicast communication. It is needed to be unique in every subsystem - JGroups, HornetQ etc. because we must avoid to interfere each other => port assignation must be unique for every a such component.
This change is needed in both - IPV4 and IPv6...