Get/Set MTU Size from the Command Line of Mac OS X

MTU stands for Maximum Transmission Unit, and a larger MTU size generally increases efficiency of a network connection because each packet carries more data, but sometimes the default MTU sizes (often 1500) will cause issues with some networks and needs adjusting. 

 To get current MTU size:
networksetup -getMTU en0

To change that and set a new MTU size:

networksetup -setMTU en0 1453

Comments

  1. UnknownMay 2, 2018 at 9:32 AM

    FYI, this only works for physical interfaces.

    For additional interfaces like ones created by VPN's etc you need to use the ifconfig tool.

    IE, the following will set the MTU to 1400 for the utun1 interface
    ifconfig utun1 mtu 1400

    ReplyDelete
  2. UnknownMay 2, 2018 at 9:32 AM

    This comment has been removed by the author.

    ReplyDelete

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