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Troubleshooting Procedures
59
D3CM1604V EMTA Cable Modem Administrator Manual
Testing the Path from a Computer to the Internet
After verifying that the path between your computer and EMTA is working properly, use the
following procedure to test the path from your computer to the Internet.
To test the path using ping from a Windows PC:
1. From the Windows task bar, click
Start
and select
Run
.
2. In the
Open
field, type
cmd
and click
OK
. A DOS command window appears.
3. At the
>
prompt, type
ping -n 10 IPaddress
where
IPaddress
is the IP address of a
remote device (such as your ISP’s server) or Web site (such as www.yahoo.com).
4. Press Enter. If the path is working, a reply similar to the one in the previous section
appears. If you do not receive replies:
Ÿ
Confirm that your computer has the IP address of the EMTA listed as the default EMTA.
If your computer’s IP address is obtained automatically through DHCP, this information
will not be visible in your computer’s Control Panel. Verify that the EMTA’s IP address is
shown as the TCP/IP default EMTA.
Ÿ
Check whether your computer’s network address (the portion of the IP address specified
by the netmask) is different than the network address of the remote device.
5. When you finish, type
exit
at the command prompt and press Enter to close the window.
Using Ping on a Macintosh
To ping on a Macintosh:
1. Click on
Go > Applications > Utilities
.
2. Click on
Network Utility
, and then click the
Ping
tab. A page similar to the one in Figure
5-5 appears.
3. In the first field, enter the IP address you want to ping.
4. Using the options below the field, select an unlimited number of pings or send a specific
number of pings.
5. Click the
Ping
button. If you receive:
Ÿ
reply from...
, the destination IP address was contacted successfully.
Ÿ
request timed out
, the destination IP address was not contacted successfully.
Ÿ
destination host unreachable
, you are not on the same subnet as the destination
address. Change your IP address to communicate with the destination address.