Method for addressing at least one end point (TEa,... TEz) in a network which has an access node and a service node being connectable thereto and being configured as a broadband access node, the network access being established for the at least one end point (TEa,... TEz) via at least one interface of the access node configured as a DSL port, and the access node managing the real MAC network addresses (MACa,.... TEz).... MACx, MACy, MACz) of the connected endpoints (TEa,... TEz), one endpoint (TEa) each being connected via one of said interfaces, and the following steps being carried out for addressing messages for operating and maintenance purposes which are exchanged between the service node and the respective endpoint (TEa) which serve as endpoints with respect to an operating and maintenance function: - the real network addresses (MACa,... MACx, MACy, MACz) of the connected end points (TEa,... TEz) are stored by the access node, wherein also those network addresses are determined and continuously renewed, which have only a predeterminable validity period; - an information message is sent from the access node to the service node via a control channel as part of a network protocol, the message indicting virtual network addresses (vMACa,...vMACx, vMACy, vMACz) assigned to the endpoints (TEa,... TEz) which are connected to the access node to enable the service node to address said message for operation and maintenance purposes to the at least one endpoint (TEa); - from the access node, an interworking function is performed by checking whether the real network address (MACa) is known in the access node for this end point (TEa) when a message for operational and maintenance purposes comes from the service node and is addressed to the respective end point (TEa), wherein: - in the access node the virtual network address (vMACa) is replaced by the real network address (MACa) and the message for operational and maintenance purposes is forwarded by means of the real network address (MACa) via said interface, if this real network address (MACa) is known; or - the incoming message for operational and maintenance purposes is forwarded by means of a broadcast address (MAC*) via said interface, if the real network address of the endpoint (TEa) is unknown or the validity period of the network address has expired; and - from the endpoint (TEa) to which the message for operational and maintenance purposes is addressed, a response message is sent to the service node, the access node addressing and forwarding this response message by means of a real network address (MACO) associated with the service node. - the real network addresses (MACa,... MACx, MACy, MACz) of the connected end points (TEa,... TEz) are stored by the access node, wherein also those network addresses are determined and continuously renewed, which have only a predeterminable validity period; - an information message is sent from the access node to the service node via a control channel as part of a network protocol, the message indicting virtual network addresses (vMACa,...vMACx, vMACy, vMACz) assigned to the endpoints (TEa,... TEz) which are connected to the access node to enable the service node to address said message for operation and maintenance purposes to the at least one endpoint (TEa); - from the access node, an interworking function is performed by checking whether the real network address (MACa) is known in the access node for this end point (TEa) when a message for operational and maintenance purposes comes from the service node and is addressed to the respective end point (TEa), - in the access node the virtual network address (vMACa) is replaced by the real network address (MACa) and the message for operational and maintenance purposes is forwarded by means of the real network address (MACa) via said interface, if this real network address (MACa) is known; or - the incoming message for operational and maintenance purposes is forwarded by means of a broadcast address (MAC*) via said interface, if the real network address of the endpoint (TEa) is unknown or the validity period of the network address has expired; and - from the endpoint (TEa) to which the message for operational and maintenance purposes is addressed, a response message is sent to the service node, the access node addressing and forwarding this response message by means of a real network address (MACO) associated with the service node.