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How I can change my MTU over 1500?

Anonymous
2022-01-24T02:39:56+00:00

OS : Windows 10 version 21H2 (Lastest release)

i can't change mtu over 1500 by

'netsh interface ipv4 set subinterface "target" mtu=9000'

and it dosn't work!!

but

'netsh interface ipv4 set subinterface "target" mtu=1500'

is working

how can i change MTU over 1500???

p.s I already enable jumbo frames for it's nic

Windows for home | Windows 10 | Internet and connectivity

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Anonymous
2022-03-09T15:41:36+00:00

The January 2022 update for Windows 10 (KB5009543) and 11 (KB5009566) broke the ability to set an MTU larger than 1500, even on a virtual adapter for a VPN. Removing these updates restores the ability to set MTUs above 1500.

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Anonymous
2022-03-31T11:57:11+00:00

We have come to the same conclusion.
In fact, it broke already in the december update. And unfortunately most computers refuse to uninstall the december update.
We have found that MTU>1500 does not work if either of these these updates for Windows 10 are installed: KB5010342, KB5009543, KB5008212

Any idea when this can be fixed?

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6 additional answers

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  1. Anonymous
    2022-03-31T15:50:18+00:00

    It would be great if Microsoft fixed this problem as it is affecting many people.

    I have tried to fix it with all the options showed on previous comments and even changing the registers but this does not work.

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  2. Anonymous
    2022-01-24T06:36:10+00:00

    I'm standing by here to help you once you report back the results of the steps I requested.

    I not only gave you the exact way to do what you asked, I also provided the most helpful tips on the web for optimizing the MTU, far more than anyone else online would have taken the time to provide.

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  3. Anonymous
    2022-01-24T03:28:55+00:00

    Hello, I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.

    See here how to set MTU over 1500, also everything you need to know about optimizing it for your network:

    https://www.ni.com/documentation/en/ni-usrp/19....

    https://www.techtarget.com/searchnetworking/def...

    https://homenetworkgeek.com/mtu-size/

    https://www.techrepublic.com/article/how-to-opt...

    Feel free to ask back any questions. If you'll report back results for each step it can help determine what else needs to be tried. I will stick with you until it is fixed.

    ______________________________________________

    Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

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