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How To: Change and Check Windows MTU Size

How To: Change and Check Windows MTU Size

As part of network troubleshooting, you may need to check or change the Maximum Transmission Unit (MTU) on your Windows machine network interface card. The MTU is the size of a network packet that can be communicated in a single network transmission. Learn more about testing here.

 

First, let’s check MTU settings in Windows. 

1. Open a Command Prompt CMD (Right Click CMD -> Run Ad Administrator)

2. Type the following:

netsh interface ipv4 show subinterfaces

3. Our MTU size is 1500 which is the default MTU size on most systems.

Windows change mtu command line

 





Change Windows MTU Size

1. Open a Command Prompt CMD (Right Click CMD -> Run Ad Administrator)

2. Type the following commands in order

netsh
interface
ipv4

3. Your command window will now be at the prompt to change MTU using the next command below.

4. Finally, type the following command to change your Windows MTU. In the example, we will be changing the MTU to 1200.

Note: the “Local Area Connection 3” will be name of the interface you see when you ran netsh interface ipv4 show subinterfaces command. This will likely be a different name.

set subinterface “Local Area Connection 3” mtu=1200 store=persistent

 

Windows netsh set subinterface mtu

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Sunday, 21 October 2018
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