A method (100), performed by an Extensible Authentication Protocol (EAP) authenticator in a communication network, is disclosed. The method comprises obtaining an identification of at least one EAP method supported by an EAP authentication server providing an EAP authentication service to the EAP authenticator (110), wherein the identification is obtained from a network entity of the communication network or from inspection of traffic through the EAP authenticator. The method also comprises providing the identification of at least one EAP method to a device operable to request communication network access from the EAP authenticator (120). Also disclosed is a method (300), performed in an EAP authentication server in a communication network, the method comprising receiving a request for identification of EAP methods supported by the EAP authentication server (310), and sending a response to the request identifying at least one EAP method supported by the EAP authentication server (320). An EAP authenticator (500, 700, 900), EAP authentication server (600, 800, 1000) and computer program configured to carry out methods performed in an EAP authenticator and EAP authentication server are also disclosed.