You may need to restart your modem after plugging your PC to the modem for the modem to recognize the new device and provision IP. However, since your router had been purchased for quite a long time, getting a new one is also advisable. <br />Consider a high quality one like the TP-Link AX3000 WiFi 6 Router: <a target="_blank" href="https://amzn.to/3yMWmDU">https://amzn.to/3yMWmDU</a>