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Cannot increase MTU setting for virtual machines running Solaris with VMXNET3 network interface (2032669)

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Details

You cannot increase the MTU setting for virtual machines running Solaris 10 or 11 as the guest operating system and using a VMXNET3 network interface. This error occurs even after successfully installing VMware Tools and restarting the virtual machine.

Solution

Modify the virtual machine's /kernel/drv/vmxnet3s.conf file. Specifically, at the end of the section:

# MTU --
#
# Set MTU for each vmxnet3s# adapter.
#
# Minimum value: 60
# Maximum value: 9000
#
#MTU=1500,1500,1500,1500,1500,1500,1500,1500,1500,1500;

append the following:
MTU=9000,9000,9000,9000,9000,9000,9000,9000,9000,9000;

Then reboot the virtual machine.
 
Note: If the virtual machine is running Solaris 11, instead of modifying the /kernel/drv/vmxnet3s.conf file, you can change the network adapter from VMXNET3 to e1000.
 

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