In PXC 5.5 setting wsrep_node_incoming_address is NOT necessary for the wsrep_incoming_address to work well (auto mode works), while in 5.6 it is the only way to make it work. So it is about regression in 5.6.
In PXC 5.5 setting wsrep_node_ incoming_ address is NOT necessary for the wsrep_incoming_ address to work well (auto mode works), while in 5.6 it is the only way to make it work.
So it is about regression in 5.6.