AC1600 WiFi VDSL/ADSL Modem Router Model D6400
•Does your WiFi device support the security that you are using for your WiFi network
(WEP, WPA, or WPA2)? For information about changing the WiFi security, see Manage
the Basic WiFi Settings and WiFi Security of the Main Network on page 93.
Tip: If you want to change the WiFi settings of the modem router’s main
network, use a wired connection to avoid being disconnected when
the new WiFi settings take effect.
If your WiFi device finds your network but the signal strength is weak, check these conditions:
•Is your modem router too far from your WiFi device or too close? Place your WiFi device
near the modem router but at least 6 feet (1.8 meters) away and see whether the signal
•Are objects between the modem router and your WiFi device blocking the WiFi signal?
Troubleshoot Your Network Using the Ping Utility
Most network devices and routers contain a ping utility that sends an echo request packet to
the designated device. The device then responds with an echo reply. You can easily
troubleshoot a network using the ping utility in your computer or workstation.
Test the LAN Path to Your Modem Router
You can ping the modem router from your computer to verify that the LAN path to your
modem router is set up correctly.
To ping the modem router from a Windows computer:
1. From the Windows taskbar, click the Start button and select Run.
2. In the field provided, enter ping followed by the IP address of the modem router, as in this
3. Click the OK button.
A message such as the following one displays:
Pinging <IP address> with 32 bytes of data
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
If the path is not working, you see this message:
Request timed out