A method performed by a radio network equipment distributed unit (10,1600), the method comprising: transmitting (710, 810), to a radio network equipment central unit (20, 1700), a message that indicates an update to a transport layer address of a radio network equipment distributed unit (10, 1600) from an old transport layer address to a new transport layer address, wherein the message indicates the old transport layer address and indicates the new transport layer address, wherein, multiple user plane bearers or transport layer tunnels (17-1...17-N) are associated with the old transport layer address, and the message informs that for each of the multiple user plane bearers or transport layer tunnels (17-1...17-N) associated with the old transport layer address, the old transport layer address is to be updated to the new transport layer address, and wherein (i) the radio network equipment distributed unit (10, 1600) is a distributed unit of an integrated access backhaul, IAB, node, and wherein the radio network equipment central unit (20, 1700) is a central unit of an IAB donor that is a donor for the IAB node, or (ii) the radio network equipment distributed unit (10, 1600) is a distributed unit of a radio network equipment (1500, 10, 40, 11, 1600) and the radio network equipment central unit (20, 1700) is a central unit of the same radio network equipment (1500, 10, 40, 11, 1600). transmitting (710, 810), to a radio network equipment central unit (20, 1700), a message that indicates an update to a transport layer address of a radio network equipment distributed unit (10, 1600) from an old transport layer address to a new transport layer address, wherein the message indicates the old transport layer address and indicates the new transport layer address, wherein, multiple user plane bearers or transport layer tunnels (17-1...17-N) are associated with the old transport layer address, and the message informs that for each of the multiple user plane bearers or transport layer tunnels (17-1...17-N) associated with the old transport layer address, the old transport layer address is to be updated to the new transport layer address, and wherein (i) the radio network equipment distributed unit (10, 1600) is a distributed unit of an integrated access backhaul, IAB, node, and wherein the radio network equipment central unit (20, 1700) is a central unit of an IAB donor that is a donor for the IAB node, or (ii) the radio network equipment distributed unit (10, 1600) is a distributed unit of a radio network equipment (1500, 10, 40, 11, 1600) and the radio network equipment central unit (20, 1700) is a central unit of the same radio network equipment (1500, 10, 40, 11, 1600). (i) the radio network equipment distributed unit (10, 1600) is a distributed unit of an integrated access backhaul, IAB, node, and wherein the radio network equipment central unit (20, 1700) is a central unit of an IAB donor that is a donor for the IAB node, or (ii) the radio network equipment distributed unit (10, 1600) is a distributed unit of a radio network equipment (1500, 10, 40, 11, 1600) and the radio network equipment central unit (20, 1700) is a central unit of the same radio network equipment (1500, 10, 40, 11, 1600).