The invention relates to a method for separating IP packets which can be allocated to specific groups in a packet-based mobile radio network. All IP packets entering into the mobile radio network are tested in a first authorized network element of the mobile radio network with respect to allocation to at least one group. A group-specific marking is produced, at least for IP packets which can be allocated to a specific group, in a field of a header of at least one packet, especially one of said IP packets.