Introduction

To enable Jumbo packets on server core is not as straight forward as a “full fat” version of windows. It just needs a little powershell know how.

Resolution

The first step is to ensure at the VMware level you are using a “VMXNET 3” adapter.

VMXNET 3 adapter

The next step is to ensure the machine is set to use jumbo packets at the virtual nic level using:

netsh interface ipv4 show interfaces

and also possibly the ipv6 version of the command if you have ipv6 configured

netsh interface ipv6 show interfaces

Once confirmed, set the MTU using:

netsh interface ipv4 set subinterface "15" mtu=9000 store=persistent
netsh interface ipv6 set subinterface "15" mtu=9000 store=persistent

Once completed you will see the following info to replace the standard 1500 MTU size:

Windows MTU 9000

The final step is to ensure the adapter is set to accept jumbo frames on the interface:

Set-NetAdapterAdvancedProperty -Name "Ethernet 2" -DisplayName "Jumbo Packet" -RegistryValue "9014"
Get-NetAdapterAdvancedProperty

Jumbo Packets Allowed

Easy when you know how.

Set Jumbo Frame on Server Core
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