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How I can change my MTU over 1500?

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

Answer
Answer

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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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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Question Info

Last updated April 17, 2024 Views 7,752 Applies to: