Re: Replacing my new Mac

Howard Brazee <howard@xxxxxxxxxx> wrote:

On Sun, 20 Jan 2008 18:26:46 -0600, Jolly Roger <jollyroger@xxxxxxxxx>
wrote:

I turned everything off, restarted my iMac and connectivity is still
missing. This time I wrote down the whole message about the
conflict.

Do you plan to tell us the error message? ; )

I wasn't sure it was a good idea:

IP Configuration
192.168.123.100 is in use by 00:00:48:a9:99:2b, DHCP
Server 192.168.123.1

That error message means your Mac is trying to use the same IP address
as another device on your Ethernet or wireless network.

The usual explanation for this is that you have a device on the network
which is configured to use a fixed address, while other devices are
configured to get their address from a DHCP server, and you haven't
correctly configured the DHCP server.

The DHCP server (your router) must be set up to exclude any fixed
addresses from the range of addresses it allocates via DHCP. The easiest
way to do this is to split your address range in half, and use fixed
addresses in one half and dynamic addresses in the other half.

In this case, the error is indicating that you have a device using the
address 192.168.123.100. The 00:00:48:A9:99:2B is the unique physical
network address of that device. You should be able to identify the
device if you can find the physical address (sometimes called a "MAC
Address" or "Ethernet Address") for each device connected to your
network. For many devices it is printed on a label on the outside of the
device (it might be written as a twelve digit hex number with no
punctuation, or with spaces or hyphens instead of colons). It may be
harder to find for a computer.

A little research reveals that the 00:00:48 prefix is assigned to Seiko
Epson. It is therefore highly likely that the device in question is a
networked Epson printer, or some other device made by Epson - it might
be a network interface card in another computer, for example.

Check all the devices attached to your network and confirm how they are
configured to get their IP address. In particular, confirm that all
computers are set to use a DHCP server, and not to manually assign an
address. If you have any other devices (such as a printer) connected to
the network, it might have a fixed address. If so, you should adjust the
configuration in your router so that it doesn't try to allocate
192.168.123.100 as a dynamic address. Limit it to allocate addresses
192.168.123.2 through 192.168.123.99, for example.

--
David Empson
dempson@xxxxxxxxxxxxx
.

Relevant Pages

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