The router is fine, but I can't receive the packet. What should I do?

Only send data, not receive data, do you mean the network of wireless router or the notebook connected to wireless router? If it is the former, it is necessary to check whether the wan port setting of the wireless router is correct. If it is the latter, there are many problems to consider. 1, whether the wireless router uses static IP address or DHCP, your notebook should be set accordingly. If it is static IP, please set the corresponding IP address, gateway, subnet mask, dns and other parameters. If it is DHCP, please execute the IPconfig /all command on the notebook to see if the notebook has obtained the IP address correctly. 2. If you don't get the correct address, please check whether your laptop is connected to your wireless router. Sometimes you may connect to someone else's wireless router, because the SSID of the wireless router is the same as that of others. It's better to change the SSID of your wireless router to a special personalized name, instead of being consistent with others. 3. Check whether the wireless router has turned on MAC address binding or IP filtering. If so, please add your notebook MAC and let it pass. Detailed settings are included in the router description. For details, please refer to the corresponding instructions. The following article is also well written and can also be used as a reference. This is the tp-link router "Detailed description of TP-Link wireless router settings".