Enable Jumbo Frame on Hyper-V Server

I have some hyper-v servers with broadcom NICs. Due to lack of UI (device manager and property window of NIC), it’s not easy to enable Jumbo Frame (MTU9000) setting.

After a google dig and some experiment, I find a way to achieve that.

  1. Install BACS (Broadcom Advanced Control Suite). You may want to use this tool for creating team also. Remember the 4-digit number within brackets before the NIC you want to change MTU.
  2. Open regedit, expand HKEY_LOCAL_MACHINE\CurrentControlSet\Control\Class\4D36E972-E325-11CE-BFC1-08002BE10318}\(4-digit-number-of-NIC) on the left panel, you will get a value named “*JumboMTU” on the right. Change it to 9014 or any other value you need.
  3. Type this command “netsh int ipv4 sh int” to list all network. Remember the Name of the connection you want to change MTU.
  4. Type this command to change it to 9000 or any other value. The value should be the value you’ve set in step 2, minus 14:
    netsh interface ipv4 set subinterface “Connection Name” mtu=9000 store=persistent
  5. Reboot to apply.

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