Howto change Max Transfer Unit (MTU) size in Vista
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The default Max Transfer Unit (MTU) size for ethernet is 1500 bytes, if using a network with a different MTU size, then one should make sure to configure MTU in Windows to avoid packet fragmentation or connection loss.
You can check the current MTU size using the following command from your command prompt
netsh interface ipv4 show subinterfaces
To change the MTU size of sub-interface no. 1
netsh interface ipv4 set subinterface “1″ mtu=1500 store=persistent
If you have more than one NICs and you want to see which subinterface is, you need to run:
netsh interface ipv4 show interfaces
The result will be like this:
Idx Met MTU State Name
— — —– ———– ——————-
1 50 4294967295 connected Loopback Pseudo-Interface 1
17 25 1500 connected Wireless Network Connection 1
19 25 1500 connected Wireless Network Connection 2
Hence, if you like to change MTU of “Wireless Netwrok Connection 1?, you should run command:
netsh interface ipv4 set subinterface “17? mtu=1384 store=persistent
and so on for the other interfaces.
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