Set MTU Size from Command Line of Mac OS

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What is MTU?

MTU stands for Maximum Transmission Unit, and a larger MTU size generally increases the efficiency of a network connection as each packet contains more data, but sometimes the default MTU sizes (often 1500) cause problems with some networks and need to be adjusted. If you need to change the MTU size on a Mac, you can do it from the command line and from the System Preferences panel. We will focus on setting the MTU size from the command line in this particular walkthrough.

Changing the MTU size has been a useful solution to Wi-Fi dropouts in OS X and Mac OS, especially when the default troubleshooting protocol for deleting the wireless pref files has failed to resolve stubborn Wi-Fi -to solve the problems.

If you are in a situation where you need to change the transmission unit size, you can easily do it from the Mac command line using the always handy network setup utility. It’s probably important to note that most users never need to adjust this setting, making it a more advanced tip. Let’s start by getting the current MTU size from the command line on a Mac, then move on to set a new MTU size.

How to Get current MTU size on Mac through the command line

To see the current MTU size, use the following network configuration flag, and point it to the network interface as follows:

network setup -getMTU and 1

Unless changed, the default MTU size in Mac OS X is 1500 and will be reported as follows:

Active MTU: 1500 (current setting: 1500)

Since 1500 is the default, we are going to change the MTU size.

How to Change MTU size on Mac via command line

To change and set a new MTU size, you can use the -setMTU flag with the network setup command line, then choose the interface and specify a new MTU size, such as:

network setup -setMTU en0 1453

en0, in this case, is the Wi-Fi interface of a MacBook Air without an ethernet port, and 1453 is the MTU setting chosen for the example, as this is the magic number that causes a persistent wireless network drop problem with some Macs dissolved.

You can verify that the change has taken place by reusing the -getMTU flag to verify the number.

For the change to actually take effect, you’ll likely want to disable and enable the Wi-Fi connection, which can also be done through network settings on the command line or through the drop-down menu for Wi-Fi on a Mac, although it isn’t always necessary.

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Set MTU Size from the Command Line of Mac OS X: FAQ

Tutorial Summary: Set MTU Size from the Command Line of Mac OS X

In this guide, we told you about Set MTU Size from the Command Line of Mac OS X; please read all steps so that you understand Set MTU Size from the Command Line of Mac OS X in case if you need any assistance from us, then contact us.

How this tutorial helping you?

So in this guide, we discuss the Set MTU Size from the Command Line of Mac OS X, which undoubtedly helps you.

What is actual time in which this method complete?

The time to complete the Set MTU Size from the Command Line of Mac OS X tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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