User's Manual

Troubleshooting
109
N600 Wireless Dual Band Router WNDR3400v3
• Wrong physical connections
For a wired connection, make sure that the numbered LAN port LED is on for the port to
which
you are connected.
Check that the appropriate LEDs are on for your network devices. If your router and
computer are
connected to a separate Ethernet switch, make sure that the link LEDs are
on for the switch ports that are connected to your computer and router.
• W
rong network configuration
Verify that the Ethernet card driver software and TCP/IP software are both installed and
configured
on your computer.
Verify that the IP address for your router and your computer are correct and that the
a
ddresses are on the same subnet.
Test the Path from Your Computer to a Remote Device
After verifying that the LAN path works correctly, test the path from your computer to a remote
device.
1. F
rom the Windows toolbar, click the Start button, and select Run.
2. I
n the Windows Run window, type:
ping -n 10 <IP addre
ss>
where <IP address> is the IP address of a remo
te device such as your ISP DNS server.
If the path is functioning correctly, replies as
shown in the previous section are displayed.
If you do not receive replies:
• Check t
hat your computer has the IP address of your router listed as the default gateway.
If the IP configuration of your computer is assigned by DHCP, this information is not
visible in your computer’s Network Control Panel. Verify that the IP address of the router
is listed as the default gateway.
• Check to see th
at the network address of your computer (the portion of the IP address
specified by the subnet mask) is different from the network address of the remote device.
• Check that
your cable or DSL modem is connected and functioning.
• If your ISP
assigned a host name to your computer, enter that host name as the account
name in the Internet Settings screen.
• Y
our ISP could be rejecting the Ethernet MAC addresses of all but one of your computers.
Many broadband ISPs restrict access by allowing tra
ffic only from the MAC address of your
broadband modem, but some ISPs additionally restrict access to the MAC address of a
single computer connected to that modem. If so, configure your router to “clone” or “spoof”
the MAC address from the authorized computer.