A data packet sending method in a communications network, wherein the communications network comprises a source mobile node, a destination mobile node and a designated routing node, each of the source mobile node and the destination mobile node is attached to a corresponding current mobile router and is assigned at least one home address thereby, the method comprising: obtaining, by the current mobile router corresponding to the source mobile node, a first data packet forwarded by the source mobile node, and determining, according to routing control policy information, whether to enable routing control for the first data packet, wherein the routing control policy information comprises indication information about whether routing control is enabled, and in a case in which the indication information indicates that routing control is enabled, the routing control policy information further comprises home address status information, wherein the home address status information comprises address information of the designated routing node; if routing control is enabled, sending, by the current mobile router corresponding to the source mobile node, the first data packet to the designated routing node through a tunnel between the current mobile router corresponding to the source mobile node and the designated routing node, obtaining, by the current mobile router corresponding to the source mobile node, a first processed data packet returned by the designated routing node, and sending the first processed data packet to the current mobile router corresponding to the destination mobile node, so that the current mobile router corresponding to the destination mobile node sends the first processed data packet to the destination mobile node, wherein the first processed data packet is obtained by the designated routing node by processing the first data packet; wherein after the receiving a routing control request, the method further comprises: if the indication information in the routing control policy information carried in the routing control request indicates that routing control is disabled, releasing the tunnel with the designated routing node and directly forwarding subsequent data packets from the current mobile router corresponding to the source mobile node to the current mobile router corresponding to the destination mobile node. obtaining, by the current mobile router corresponding to the source mobile node, a first data packet forwarded by the source mobile node, and determining, according to routing control policy information, whether to enable routing control for the first data packet, wherein the routing control policy information comprises indication information about whether routing control is enabled, and in a case in which the indication information indicates that routing control is enabled, the routing control policy information further comprises home address status information, wherein the home address status information comprises address information of the designated routing node; if routing control is enabled, sending, by the current mobile router corresponding to the source mobile node, the first data packet to the designated routing node through a tunnel between the current mobile router corresponding to the source mobile node and the designated routing node, obtaining, by the current mobile router corresponding to the source mobile node, a first processed data packet returned by the designated routing node, and sending the first processed data packet to the current mobile router corresponding to the destination mobile node, so that the current mobile router corresponding to the destination mobile node sends the first processed data packet to the destination mobile node, wherein the first processed data packet is obtained by the designated routing node by processing the first data packet; wherein after the receiving a routing control request, the method further comprises: if the indication information in the routing control policy information carried in the routing control request indicates that routing control is disabled, releasing the tunnel with the designated routing node and directly forwarding subsequent data packets from the current mobile router corresponding to the source mobile node to the current mobile router corresponding to the destination mobile node.