FAQ - Frequently Asked Questions - Knowledge Base

[Thunder2 10GbE Adapter] How to change the MTU settings on a Mac

To change the MTU settings for the AKiTiO Thunder2 10G Network Adapter from the default value 1500 to something else like 9000 for Jumbo, follow the instructions below.

  1. On your Mac, open the System Preferences and go to Network.
  2. Select your Thunderbolt network adapter and click Advanced...
    10gbe adapter mtu 01
  3. Go t the Hardware category and change the MTU settings.
    10gbe adapter mtu 02
  4. If the settings are greyed out (e.g. Mac OS 10.11), write down the MAC address of your adapter and then open the Terminal.
    10gbe adapter mtu 02a
  5. Enter ifconfig to list all the network interfaces and look for the MAC address of your Thunderbolt network adapter. Write down the number of your network interface (e.g. en4).
    10gbe adapter mtu 03
  6. Enter following command to change the settings. In this example, the interface is en4 and the new MTU settings are 9000.
    networksetup -setMTU en4 9000
    10gbe adapter mtu 04
  7. If you want to change the settings again after this, go back to System Preferences > Network > Advanced > Hardware and you can modify the value there.
    10gbe adapter mtu 05