disclosed herein is a method , a computer program product , and a carrier for indicating one - way latency in a data network between a first node and a second node , wherein the data network lacks continuous clock synchronization , comprising : a pre - synchronisation step , a measuring step , a post - synchronisation step , an interpolation step , and generating a latency profile . the present invention also relates to a computer program product incorporating the method , a carrier comprising the computer program product , and a method for indicating server functionality based on the first aspect .