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Duplicate IP's

By oz_cast ·
I have an error message on my Server. A duplicate name has been detected on the TCP network. The IP address of the machine that sent the message is in the data. Use nbtstat -n in a command window to see which name is in the conflict state.


when I do that I get the following

Local Area Connection:
Node IpAddress: [192.168.1.10] Scope I []
NetBIOS Local Name Table
Name Type Status
----------------------------------------------
Mikeymouse <00> UNIQUE Conflict
Minimouse <00> GROUP Registered
etc, etc etc.

Local Area COnnection 2:
Node IpAddress: [192.168.1.121] Scope I []
NetBIOS Local Name Table
Name Type Status
----------------------------------------------
Mikeymouse <00> UNIQUE Conflict
Minimouse <00> GROUP Registered
etc, etc etc.


I dont get how on the 2 nic's it has different IP's and its a conflict?

any ideas please.

Thank you

Ozzie.

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All Answers

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When you run IPCONFIG do you get an error?:

If so do this:
IPCONFIG Error
When you run IPCONFIG and get an error:
An internal error occured: The request is not supported.
Please contact Microsoft Product Support Services for further help.
Additional information: Unable to query routing information
You need to copy a clean TCPIP.SYS file to the \windows\system32\drivers directory and reboot.
You can download TCPIP.SYS from this site:
http://www.techenigma.com/articles/1745/1/Signs-of-a-corrupt-tcpipsys/Page1.html
Click under the "Attachments" section for the code.
OR:

http://support.microsoft.com/kb/289256
The command-line connectivity-repair process in the article consists of the following six commands:

ipconfig /renew
arp -d *
nbtstat -R
nbtstat -RR
ipconfig /flushdns
ipconfig /registerdns

This sequence of commands renews DHCP leases; flushes the Address Resolution Protocol (ARP) cache; reloads the NetBIOS cache and updates the NetBIOS name; and flushes the DNS cache and re-registers with DNS. . . .

Please post back if you have any more problems or questions.
If this info is useful, please mark it helpful. Thanks

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Duplicate IP's

by oz_cast In reply to When you run IPCONFIG do ...

Now do you understand that this is an error from event viewer on my Main Server.
one Nic card has an static IP address.. the second card has a DHCP IP address.
to answer your question. No.. I do not get an error message at all when I do IPCONFIG or IPCONFIG /ALL.

any other suggestions.

Regards,

Oz

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It said... duplicate NAME... not IP

by ThumbsUp2 In reply to Duplicate IP's

The error is telling you there are errors in computer NAME, the IP's of the machines with the same NAME are shown.

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Duplicate IP's

by oz_cast In reply to It said... duplicate NAME ...

Can you please advice me on how to fix this issue. I am not sure where or how to determine that my NIC's are showing the same NAME.

Regards,

Oz

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That depends on the OS being used.....

by ThumbsUp2 In reply to Duplicate IP's

Do this for all workstations in question.

In WinXP, right click on My Computer and choose Properties (or get to it through the Control Panel -> System). Go to the Computer Name tab and write down what it says next to Full Computer Name. Each computer must have a unique name. So, if you find duplicates, you must rename one of them.

If you have another OS involved, please tell us which one it is.

...

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Duplicate IP's

by oz_cast In reply to That depends on the OS be ...

I only have 2 servers and both servers have different names. I am not sure why I have that error message. I am planing on rebooting my 2 servers Tonight. wish me luck.

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Read my LIPS.....

by ThumbsUp2 In reply to Duplicate IP's

I SAID, check the workstations, all of them. I didn't say a thing about the servers.

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Duplicate Names

by NetMan1958 In reply to Duplicate IP's

The error you are getting isn't about duplicate IP's it's about duplicate names. Again, it is warning you that 2 different ip addresses are reporting the same NAME as shown here from your output you posted:

Local Area Connection:
Node IpAddress: [192.168.1.10] Scope I []
Mikeymouse <00> UNIQUE Conflict
NOTE: the word conflict after Mikeymouse

Local Area COnnection 2:
Node IpAddress: [192.168.1.121] Scope I []
Mikeymouse <00> UNIQUE Conflict
NOTE: the word conflict after Mikeymouse

Now I gather from your comments that you have 2 NIC's in this server and both have ip addresses on the same subnet (192.168.1.10 and 192.168.1.121). Do both NICs connect to the same switch or hub? If so, what's happening is that each NIC is receiving NetBios browser announcements from the other which advertises the same name (Mikeymouse). Try unplugging one of the NICs and see if your problem is resolved.

Normally, if you run 2 NICs in the same server on the same subnet, you need to setup NIC Teaming so that both NICs act as one and share 1 ip address.

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