There is provided a method, including: causing, by a second node, reception of a discovery message on a radio layer directly from a first node, wherein the discovery message indicates at least the prefix of the internet protocol, IP, address corresponding to the first node; detecting whether or not there exist an application layer connection between the first node and the second node, wherein the application layer is a higher layer than the radio layer and the detection is at least partly based on the acquired prefix; and upon detecting that the application layer connection exists, indicating the existence of the application layer connection to a network element associated with the second node.