The present invention discloses a gateway and its method of transferring data, the gateway being connected to a network by a SIMM-node. In response to a request to establish multi-MAC address routing information of a SIMM-node, multiple MAC addresses corresponding to an IP address of the SIMM-node are obtained. The multi-MAC address routing information of the SIMM-node is established at least according to the obtained multiple MAC addresses corresponding to the IP address of the SIMM-node. In response to receiving a data message sent to the IP address of the SIMM-node, the data message is routed by using the established multi-MAC address routing information of the SIMM-node.