You are called in to troubleshoot a WLAN problem in a small office for an accounting firm. None of the employees can access the Internet; however, they do show a connection to the SOHO wireless router. Users were able to access the Internet prior to your being called in. You start by testing one user's workstation and issue a ping command to the wireless router. You do get a ping response, but you cannot ping across the router to a valid IP address on the Internet. What could cause the problem based on the symptoms you experienced