If this is the case you could remove the 'Obtain an IP Address automatically' from one of the devices
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A duplicate name exists on the network
I have a Windows 2003 Enterprise Server box that runs AD, DHCP and DNS. The problem is that when some users login they receive an error message that states "A duplicate name exists on the network". I check the DHCP leases and it it shows that their computer has been given 2 different IP addresses at the same time (within 1 second). I've removed the DHCP scope, readded it and still get the same problem. I have XP Pro and XP Home (bad I know, but I can't get them to spend the money to upgrade them) on the network. The problem happens with computers of either OS. Any thoughts would be greatly appreciated
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Answers
Any other IP type network devices (firewire cards) etc, you could look at the MAC address that the DHCP server is dishing an address out to, if they are different then two devices are present.
When this happens if you type inconfig /all on the laptop into a DOS prompt it should show the devices that have addresses allocated.
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by: ReidAWPosted on 2007-07-18 at 12:28:01ID: 19516576
Do the machines that are suffering from this problem have multiple network cards/ devices that support IP, I just wonder if both interfaces are getting addresses, then hey presto two addresses with the same name.