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Installing VMware Tools from ESXi 5.0 on a Solaris virtual machine changes MTU to 9000

Symptoms

After installing/upgrading to VMware Tools from ESXi 5.0/ESXi 5.0 Update 1 on the Solaris guest operating system, you experience these symptoms:

  • MTU increases to 9000 automatically on vmxnet3 adapters
  • Even if the MTU is changed to 1500, it reverts to 9000 when you reboot of the guest operating system

Resolution

This is a known issue and is scheduled to be resolved in a future release.

To workaround the issue:

  • If you wish to use Jumbo Frames, see Enabling Jumbo Frames on the Solaris guest operating system (2012445).
  • If you do not want to use Jumbo Frames, add these lines to a startup script for the guest operating system:

    ndd -set /dev/adapter_name accept-jumbo 0
    ifconfig adapter_name mtu 1500
Where adapter_name is the name of your adapter.

Based on VMware KB 2030524

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