Reference Manual for the Model CG814M Wireless Cable Modem Gateway

6-4

Troubleshooting

•

Make sure you are using the correct login information. The factory default login name is

admin

and the password is

password

. Make sure that CAPS LOCK is off when entering this

information.

If the gateway does not save changes you have made in the Web Configuration Interface, check the

following:

•

When entering configuration settings, be sure to click the APPLY button before moving to

another menu or tab, or your changes are lost.

•

Click the Refresh or Reload button in the Web browser. The changes may have occurred, but

the Web browser may be caching the old configuration.

Troubleshooting the ISP Connection

If your gateway is unable to access the Internet and your Cable Link LED is on, you may need to

register the Cable MAC Address and/or Device MAC Address of you gateway with your cable

service provider. This is described in

“Configuration“ on page 2-11

.

Additionally, your PC may not have the gateway configured as its TCP/IP gateway. If your PC

obtains its information from the gateway by DHCP, reboot the PC and verify the gateway address

as described in

“Verifying TCP/IP Properties“ on page C-6

.

Troubleshooting a TCP/IP Network Using a Ping Utility

Most TCP/IP terminal 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. Troubleshooting a TCP/IP

network is made easier by using the ping utility in your PC or workstation.

Testing the LAN Path to Your Gateway

You can ping the gateway from your PC to verify that the LAN path to your gateway is set up

correctly.

To ping the gateway from a PC running Windows 95 or later:

1.

From the Windows toolbar, click on the Start button and select Run.

2.

In the field provided, type Ping followed by the IP address of the gateway, as in this example:

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Reference Manual for the Model CG814M Wireless Cable Modem Gateway

Troubleshooting

6-5

ping 192.168.0.1

3.

Click on OK.

You should see a message like this one:

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, you could have one of the following problems:

•

Wrong physical connections

—

Make sure the LAN port LED is on. If the LED is off, follow the instructions in

“Local Link LEDs Not On

” on

page 6-2

.

—

Check that the corresponding Link LEDs are on for your network interface card and

for the hub ports (if any) that are connected to your workstation and gateway.

•

Wrong network configuration

—

Verify that the Ethernet card driver software and TCP/IP software are both installed

and configured on your PC or workstation.

—

Verify that the IP address for your gateway and your workstation are correct and that

the addresses are on the same subnet.

Testing the Path from Your PC to a Remote Device

After verifying that the LAN path works correctly, test the path from your PC to a remote device.

From the Windows run menu, type:

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 in the previous section are displayed. If you do not

receive replies:

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Reference Manual for the Model CG814M Wireless Cable Modem Gateway

6-6

Troubleshooting

—

Check that your PC has the IP address of your gateway listed as the default gateway. If the

IP configuration of your PC is assigned by DHCP, this information will not be visible in

your PC’s Network Control Panel. Verify that the IP address of the gateway is listed as the

default gateway as described in

“Verifying TCP/IP Properties“ on page C-6

.

—

Check to see that the network address of your PC (the portion of the IP address specified

by the netmask) is different from the network address of the remote device.

—

Check that your Cable Link LED is on.

—

If your ISP assigned a host name to your PC, enter that host name as the Account Name in

the Basic Settings menu.

—

Your ISP could be rejecting the Device MAC Address of your gateway because it does not

match the MAC Address of the PC you previousy used to connect to a cable modem. In

this case you will need to clone your PCs MAC Address. Refer to

“Configuration“ on

page 2-11

.

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Reference Manual for the Model CG814M Wireless Cable Modem Gateway

Technical Specifications

A-1

Appendix A

Technical Specifications

This appendix provides technical specifications for the CG814M Wireless Cable Modem

Gateway.

Network Protocol and Standards Compatibility

Data and Routing Protocols:

TCP/IP

DHCP server and client

DNS relay

NAT (many-to-one)

TFTP client

VPN pass through (IPSec, L2TP)

Power Adapter

North America (input):

120V, 60 Hz, input

All regions (output):

12 V DC @ 1.25A output, 20W maximum

Physical Specifications

Dimensions:

255 by 169 by 34 mm

10.0 by 6.7 by 1.3 in.

Weight:

0.54 kg

1.2 lb.

Environmental Specifications

Operating temperature:

32

°

-140

°

F (0

°

to 40

°

C)

Operating humidity:

90% maximum relative humidity, noncondensing

Electromagnetic Emissions

Meets requirements of:

FCC Part 15 Class B

Interface Specifications

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Reference Manual for the Model CG814M Wireless Cable Modem Gateway

A-2

Technical Specifications

Local:

10BASE-T or 100BASE-Tx, RJ-45

USB 1.1 Function

802.11b Wireless Access Point

Internet:

DOCSIS 1.0, upgradeable to DOCSIS 1.1

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