Microsoft KB Archive/944815

= Network connection of guest machine is broken after performing a Cluster failover =

Article ID: 944815

Article Last Modified on 11/7/2007

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APPLIES TO


 * Microsoft Virtual Server 2005 R2 Enterprise Edition

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Source: Microsoft Support



RAPID PUBLISHING
RAPID PUBLISHING ARTICLES PROVIDE INFORMATION DIRECTLY FROM WITHIN THE MICROSOFT SUPPORT ORGANIZATION. THE INFORMATION CONTAINED HEREIN IS CREATED IN RESPONSE TO EMERGING OR UNIQUE TOPICS, OR IS INTENDED SUPPLEMENT OTHER KNOWLEDGE BASE INFORMATION.



Action


Result
After configuring Virtual Server Host Clustering with Virtual Server 2005 R2, you lose guest network connectivity after failover.

If you view the properties of the Virtual Network, the NIC binding has changed to another NIC in the server.

Also, the following event may be logged:

Event ID: 1042

Source: Virtual Server

&quot;Could not find the virtual network attached to virtual nic 2. This virtual Nic has been reattached to the virtual network&quot;



Cause
The options.xml file on each node needs to have the same ID for each network. Otherwise, this issue could occur.



Resolution
Manually edit the options.xml file on each node to ensure the ID values correspond to the appropriate adapters.

Sample:

From options.xml - (C:\Documents and Settings\All Users\Application Data\Microsoft\Virtual Server)





\DosDevices\VPCNetS2_{BED88D20-7EFF-480D-B7B5-D53B701FF90D}

11

HP NC340T PCI-X Quad-port Gigabit Server Adapter

2





\DosDevices\VPCNetS2_{2DD753A9-71E1-47F9-BDDE-3D3187E58BCB}

14</id>

<name type=&quot;string&quot;>HP NC340T PCI-X Quad-port Gigabit Server Adapter #4

<type type=&quot;integer&quot;>2

</virtual_gateway>

<virtual_gateway id=&quot;3&quot;>

<adapter type=&quot;string&quot;>\DosDevices\VPCNetS2_{59D6EE72-8F52-421B-B8E6-EC83C502BD42}

13</id>

<name type=&quot;string&quot;>HP NC340T PCI-X Quad-port Gigabit Server Adapter #3

<type type=&quot;integer&quot;>2

</virtual_gateway>

<virtual_gateway id=&quot;4&quot;>

<adapter type=&quot;string&quot;>\DosDevices\VPCNetS2_{22DB184F-63BF-432F-ACCF-37C2F55EBAE3}

12</id>

<name type=&quot;string&quot;>HP NC340T PCI-X Quad-port Gigabit Server Adapter #2

<type type=&quot;integer&quot;>2

</virtual_gateway>

The ID type integer values must match on each server for whichever adapter you want paired. Once that is done, the shared .vnc file’s ID will always line up regardless which node hosts the file.

From the shared .vnc -

<gateway type=&quot;integer&quot;>11

Prior to changing the options.xml on each node, the gateway value above could change erratically depending on whether or not the ID existed within the options.xml. That would make the NIC bound to the shared network inconsistent. With matching IDs in the options.xml files it stays consistent and you can rely on it being bound to the desired NIC on failover.

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MoreInformation
For more information about configuring Virtual Server Host Clustering, you may refer to the document below:

Virtual Server Host Clustering Step-by-Step Guide for Virtual Server 2005 R2

http://www.microsoft.com/downloads/details.aspx?FamilyID=09cc042b-154f-4eba-a548-89282d6eb1b3&displaylang=en

<div class="summary_section">

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Keywords: kbnomt kbrapidpub KB944815

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