Microsoft KB Archive/310844

= Multihomed DHCP Server Assigns Duplicate IP Addresses =

Article ID: 310844

Article Last Modified on 10/27/2006

-

APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server

-



This article was previously published under Q310844



SYMPTOMS
A multihomed DHCP server may assign duplicate IP addresses.



CAUSE
This problem can occur if more than one of the network adapters in the multihomed DHCP server is connected to the same physical network segment.



WORKAROUND
To resolve this issue, use either of the following methods.

Method 1
Unbind the DHCP service from all but one of the network adapters that are connected to the same physical network segment.

Method 2
Disconnect all but one network adapter from that physical network segment.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
You can observe this problem by enabling DHCP logging. The following portion of a DHCP log demonstrates this problem:

...

10,07/24/01,12:51:14,Assign,172.16.10.109,cli103.ponpon.local,5241532000C04FA03430000000000000

10,07/24/01,12:51:17,Assign,172.16.10.109,cli103.ponpon.local,5241532000C04FA03430000001000000

...

10,07/24/01,12:51:21,Assign,172.16.10.109,cli104.ponpon.local,5241532000C04F0F96F9000001000000

...

10,07/24/01,12:52:28,Assign,172.16.10.109,cli101.ponpon.local,524153200000864DE276000000000000

10,07/24/01,12:52:31,Assign,172.16.10.109,cli101.ponpon.local,524153200000864DE276000001000000

...

10,07/24/01,12:59:15,Assign,172.16.10.109,cli1.,00B0D0A9C291

...

13,07/24/01,13:06:47,Conflict,172.16.10.109,BAD_ADDRESS,

13,07/24/01,13:06:47,Conflict,172.16.10.109,BAD_ADDRESS,

...

Note that the 172.16.10.109 IP address is being assigned to different clients over and over without first being released, which then causes a conflict, and this conflict is reported if conflict detection has been enabled on the DHCP server.

Keywords: kbbug kbnofix kbenv kbnetwork KB310844

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.