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Troubleshooting Procedures
51
D3CM1604V EMTA Cable Modem Administrator Manual
Ÿ
Last octet is any unique number from
0
to
255
(there are restrictions on using
0
and
255
,
so avoid using them). You would not use
1
as the last number, since that number is the
last octet in the EMTA IP address in our example.
Figure 5-2 shows an example of IP addresses assigned to devices on the network.
Figure 5-2. Example of IP Addresses for Networked Devices
You define the computer’s IP address using the procedure appropriate for your operating
system, as described in Chapter
3.
Tip: The following Windows sections describe how to use the command-line program
Windows IP Configuration (ipconfig) to see the IP address of a computer running a Windows
operating system. However, if you want even more information, such as IP routing and DHCP
information, type
ipconfig /all instead of ipconfig in the Windows sections that follow.
The most common problem associated when viewing IP addresses is that either:
Ÿ
A computer’s IP address is not on the same subnet as the other networked devices. In
other words, the first nine numbers (three octets) in the device’s IP address are not
identical to those of the other networked devices.
Ÿ
A computer shows an IP address that starts with the digits
169.254
. When this
happens, it often means the computer could not retrieve a network address from a
DHCP server and therefore automatically assigned itself an address from the base