Known issues

This section displays notes and limitations for working with Network Virtualization.

Additional known issues and workarounds are included in the relevant sections of the help center.


  • The Network Virtualization for Linux package (NV4LG) is supported on Oracle Enterprise Linux distributions only. For supported Oracle Enterprise Linux versions, see the Support Matrix (System Requirements).

  • If you choose to install NV automatically, you must disable the Windows SmartScreen Filter before proceeding with the NV installation.

    To do so, open HKEY_LOCAL_ MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer in the Registry Editor, and change the Value data for SmartScreenEnabled to Off.

    Note: You do not need to disable SmartScreen when installing NV manually.

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Network Virtualization Driver

  • Network Virtualization is not supported on EC2 instances type which have ENA (Elastic Network Adapter) due to a conflict with the NV Driver.

  • Jumbo frames (MTU 9000) are not supported by the NV Driver which supports packet sizes up to 1500 bytes only. Note that many EC2 instances use MTU 9000. For more details, see

    To change MTU on a network adapter:

    1. Run the following command from the command line to verify the MTU:

      netsh interface ipv4 show interfaces

    2. run the following command to change the MTU of a specific adapter:

      netsh interface ipv4 set subinterface "Adapter Name" mtu=1500

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  • Running Wireshark and NV for Load Generator at the same time on the same system may cause a system crash.

    Workaround: Avoid using Wireshark during NV emulation.

  • Running Wireshark during NV emulation may result in duplication of packets going through the NV active adapter.

    Workaround: Configure the following Windows registry key:

    In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SD\Parameters\KeepSourceHandle, set the value to 1 to prevent Wireshark from duplicating packets during emulation.

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NV Insights report

Server Time is not available in the HTTP Waterfall page and Resource Analysis page of an NV Insights report when using a proxy.

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