The invention makes a clean separation between data plane and control plane for residential gateway, and proposes a residential gateway device and a network-side control device. The residential gateway device is provided with data plane functionalities of residential gateways, wherein, the data plane functionalities of residential gateways comprises: Layer 3/4 packet processing functionalities of residential gateways; and the residential gateway device further comprises: a first interface, for exchanging control information about data plane functionalities of residential gateways, with a network-side control device provided with the control plane functionalities of residential gateways; and a controller, for configuring the data plane functionalities of residential gateways according to the control information from the network-side control device. And the network-side control device is provided with control plane functionalities of residential gateways, wherein, the network-side control device is without data plane functionalities of residential gateways, said data plane functionalities of residential gateways comprising: Layer 3/4 packet processing functionalities of residential gateways.