Large data send even set MTU=576 on Windows 10

Question

Hi,

I set MTU=576 with this command:

netsh interface ipv4 set subinterface Ethernet mtu=576 store=persistent

and reboot.

I open wireshark to monitor the data transmission, I still see large packet sending from Windows 10 even after reassembled, may I know Frame size suppose to limit MTU size? Thanks

Answer 1

Hello,

 

Thank you for posting in Q&A forum.

To further troubleshoot this issue, please kindly try below steps:

Actually even the packets are fragmented into smaller pieces if they exceed 576. However, Wireshark just reassembles these fragments to show the complete data, which is normal behavior.

To verify MTU Settings, please open CMD window and run below command:

netsh interface ipv4 show subinterface Ethernet

Please ensure that the MTU value is set to 576 and is stored persistently.

 

I hope the information above is helpful.

If you have any questions or concerns, please feel free to let us know.

 

Best regards，

Jill Zhou

 

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