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Troubleshoot the WiFi Connectivity
If you are experiencing trouble connecting over WiFi to the modem router, try to isolate the problem:
Make sure that the WiFi settings in your WiFi device and modem router match exactly.
For a device that is connected over WiFi, the WiFi network name (SSID) and WiFi security settings of the modem
router and WiFi computer must match exactly. The default SSID and password are on the product label (see
Bottom Panel Product Label
on page 17).
Does the WiFi device that you are using find your WiFi network?
If not, check the WiFi LED
on the top of the modem router. If this LED is off, both WiFi radios might be
disabled. For more information about the WiFi radios, see
Control the WiFi Radios
on page 115.
If you disabled the modem router’s SSID broadcast, your WiFi network is hidden and does not display in your
WiFi client’s scanning list. (By default, SSID broadcast is enabled.) For more information, see
View or Change
the Basic WiFi Settings
on page 97.
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
View or Change the Basic WiFi Settings
on page 97.
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.
Tip
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 strength improves.
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 example:
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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
If the path is not functioning correctly, one of the following problems might be occurring:
Wrong physical connections
For a wired connection, make sure that the numbered LAN port LED is lit for the port to which you are connected.
Check that the appropriate LEDs are on for your network devices. If your modem router and computer are
connected to a separate Ethernet switch, make sure that the link LEDs are lit for the switch ports that are
connected to your computer and modem router.
Wrong 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 modem router and your computer are correct and that the addresses are on
the same subnet.
Test the Path From Your Computer to a Remote Device
After you verify that the LAN path works correctly, test the path from your computer to a remote device.
To test the path from your computer to a remote device:
1.
From the Windows toolbar, click the
Start
button and select
Run
.
2.
In the field provided, enter
ping -n 10
IP address
where
IP address
is the IP address of a remote device such as your ISP’s DNS server.
If the path is functioning correctly, replies as described in
Test the LAN Path to Your Modem Router
on page 291
display. If you do not receive replies, do the following:
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Check to see that the IP address of your modem router is listed as the default router in your computer. 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 modem router is listed as the default router.
Check to see that the network address of your computer (the portion of the IP address specified by the netmask)
is different from the network address of the remote device.
If your ISP assigned a host name to your computer, enter that host name as the account name. For more
information, see one of the following sections:
Specify an ADSL Connection Without a Login
on page 50
Specify a VDSL Connection Without a Login
on page 59
Specify a Cable or Fiber Connection Without a Login
on page 68
Your ISP might be rejecting the Ethernet MAC addresses of all but one of your computers.
Many broadband ISPs restrict access by allowing traffic only from the MAC address of your modem, but some
additionally restrict access to the MAC address of a single computer connected to that modem. In this case,
configure your modem router to clone or spoof the MAC address from the authorized computer. For more
information, see one of the following sections:
Manually Set Up an ADSL Internet Connection
on page 50
Manually Set Up a VDSL Internet Connection
on page 59
Manually Set Up a Cable or Fiber Internet Connection
on page 68
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17
Supplemental Information
This appendix covers the following topics:
Factory Settings
on page 295
Technical Specifications
on page 297
294
Page 295 / 299
Factory Settings
You can reset the modem router to the factory default settings that are shown in the following table.
For more information about resetting the modem router to its factory settings, see
Return the Modem Router to Its
Factory Default Settings
on page 221.
Table 5. D7800 modem router factory default settings
Default Setting
Feature
Router login
www.routerlogin.net (or www.routerlogin.com or 192.168.1.1)
User login URL
admin
User name (case-sensitive)
password
Login password (case-sensitive)
Internet connection
Use default hardware address
WAN MAC address
Determined by the protocol that is used for the Internet connection (see
MTU Concepts
on page 93)
WAN MTU size
Autosensing
Port speed
Local network (LAN)
192.168.1.1
LAN IP address
255.255.255.0
Subnet mask
Enabled
DHCP server
192.168.1.2 to 192.168.1.254
DHCP range
192.168.1.2
DHCP starting IP address
192.168.1.254
DHCP ending IP address
Disabled
DMZ
North America: Pacific Standard Time
Europe: GMT
Other continents: Varies by region
Time zone
Supplemental Information
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