SLES VM unable to resolve DNS from Windows VM running on same XEN host

This document (7007604) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 11 Service Pack 1
Microsoft Windows Server 2008

Situation

SLES VM unable to resolve DNS from Windows VM running on same XEN host
Virtual Machine Driver Pack (VMDP) is installed on Windows VM

Resolution

The request is getting lost because of lack of support for UDP Checksum Offloading in the Virtual Machine Driver Pack.  You can workaround the issue by removing or disabling VMDP or by disabling TCP Checksum Offloading on the Windows VM or the SLES VM.
 
To disable TCP Checksum Offloading in Windows, go to the properties of the LAN driver -> Configure -> Advanced -> Set "TCP Checksum Offload (IPv4)" to disabled.

To disable it in SLES, run "ethtool -K eth0 tx off".  Replace eth0 with the correct device name.

 
Reported to engineering

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7007604
  • Creation Date: 19-Jan-2011
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server
    • SUSE Linux Enterprise Virtual Machine Driver Pack

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