Change MTU on NIC Adapters in Windows 2019 Core

Posted on by Jordansphere

Problem: I had an issue where I set the NIC, Team and VLAN to be MTU 9000 but I still couldn’t get jumbo frames working on the interfaces.

Solution: There is an extra set step required which involves increasing the MTU on the adapter.

In this example I have 4 port Cisco MLOM card that I need changing to Jumbo Frames.

List adapters in question:

Get-NetAdapterAdvancedProperty -Name VIC-MLOM-eth* -DisplayName "Jumbo Packet"

Change MTU on all these to 9014

Get-NetAdapterAdvancedProperty -Name VIC-MLOM-eth* -DisplayName "Jumbo Packet" | Set-NetAdapterAdvancedProperty -RegistryValue "9014"

I could then successfully use jumbo frames on these interfaces.