The present disclosure generally relates to the field of network authentication. More specifically, the present disclosure relates to a technique of determining a set of authentication protocols for authentication between a terminal and an authentication server of a communication network. A method embodiment includes obtaining information related to at least one of the terminal, an access network via which the terminal is connected to the communication network, and at least one gateway node or intermediate network via which the terminal is connected to the communication network. The method further includes determining, based on the obtained information, from a plurality of authentication protocols available for authentication between the terminal and the authentication server, at least one of a set of authentication protocols to be offered towards the terminal and a set of authentication protocols to be supported by the terminal for authentication between the terminal and the authentication server.