Abstract: Method to support a plurality of checksum algorithms in a first network node (A), according to which a communication relationship is established between the first network node (A) and a second network node (B), the initialization of which is effected by the first network node (A) in that in a first step a first checksum algorithm is selected by the first network node (A), in a second step the selected checksum algorithm is signaled to the second d network node (B) by the first network node (A), in a third step the communication relationship is established using the selected checksum algorithm if the initialization of the communication relationship by means of the selected checksum algorithm is accepted by the second network node (B) or in the third step a further checksum algorithm is selected by the first network node (A) if the initialization of the communication relationship by means of the selected checksum algorithm is rejected or ignored by the second network node (B), the second and third step then bei