This guide refers to a Westell PROLINE G90-6100 router, but will apply to most Westell routers in general.
1. Login to your router.
Login into your router’s web-based utility, by typing 192.168.1.254 into your browser.
Enter 18.104.22.168 in the “Primary DNS Server: ” field.
Enter 22.214.171.124 in the “Secondary DNS Server:” field.
Click “save and restart connection” to apply your settings.