The present invention relates to a method for informing changed link properties in a system in which a mobile node is communicating by IP (Internet Protocol) with a correspondent node and utilizing a first link layer configuration. A need to change link layer communication to use a second link layer configuration is detected. Property information indicating a link layer property applied or to be applied in communication utilizing the second link layer configuration is defined. The property information is transmitted to the correspondent node. At least one setting for communication between the correspondent node and the mobile node is adapted in the correspondent node on the basis of the received property information.