Mac OS X Jumbo Frames

Author: Samuel Williams When: Sunday, 21 February 2010

Mac OS X Ethernet usually supports jumbo frames. A jumbo frame is a frame with an MTU set (typically) to 9000 bytes. Using larger frames means that the network is optimised for throughput rather than latency.

Firstly, open "System Preferences". Click on "Network":

Choose the ethernet device you want to configure from the list on the left hand side. Click on "Advanced..." on the bottom right. On the sheet that comes down, select the right most tab "Ethernet":

Set "Configure" to "Manually". Set "Speed" to "autoselect". Set "MTU" to "Custom" and enter in "9000". This number enables jumbo frames to be sent via this ethernet adaptor.

I have found that this value does not always get saved correctly. Make sure at this point you apply the settings by clicking "OK" and then "Apply".

Comments

Hi, I have macbook pro 13” 2009 , and i do not see the option of 72-9000 i see only 1280-1500

@Slava you are probably looking at the wireless (Wi-Fi) configuration. Typical wireless hardware doesn’t support Jumbo Frames at this time.

Ok, but in the AirPort, (Wifi), doesn’t works…dont have options to set jumbo (9000)…if I m set manually the value 9000 the system don’t save the config…Is it possible to set jumbo 9000 in Wifi interface?

Tks,

Fabio

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