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You need to run and elevated command prompt. Click Start > All Programs > Accessories, right-click Command Prompt and Run as administrator, Allow it to have administrator privileges, otherwise it won't work.

Then type/copy & paste the following command:
netsh interface ipv4 set subinterface "Local Area Connection" mtu=xxxx store=persistent

Where xxxx = the MTU that you want. Rebooting isn't required. "Local Area Connection" is a common name for the interface if you use a NIC for connectivity. A wireless NIC may be called "Wireless Network Connection". If unsure, the network status icon by the clock will tell you.

If you have a router, ensure that the MTU is set to the MTU chosen here (refer to your router's manual).

Feedback received on this FAQ entry:
  • I had the same issue 'Element not found'. Seemed that hyper-V renamed my WLAN connection to "vEthernet (Wireless)". It seems netsh doesn't like () so simply renaming the wlan nic to "vEthernet Wireless" solved the issue for me (and yes, running it in an admin prompt of course ;) )

    2014-04-03 17:01:10

  • Thank you, worked fine and big help. This solved an issue with a Win7 box and slow CIFS shares to a ReadyNAS (dropping MTU frmo 1500 to 1470 in this case)

    2011-10-08 21:23:38

  • if you receive "element not found" / try running the following from an elevated cmd window less quotes: "netsh interface ipv4 show subinterfaces" look to the lower right of those results under "Interface" and be sure that you are typing the exactly as shown with quotes. For instance, my Interface had actually been re-named "Local Area Connection 2" because I had previously uninstalled my network card. Worked fine after adding the 2. Good Luck

    2011-05-12 22:04:51

  • Element not found means check your connection type you entered.

    2010-11-21 20:46:57 (redschmed45 See Profile)

  • I mistakenly entered "Local Area Connection" and got device not found. I then tried "Wireless Network Connection" and got an ok. Thanks-

    2010-11-21 20:45:25 (redschmed45 See Profile)

  • all i get when i type this in is "element not found"

    2009-06-01 13:25:23

  • Hello. I have a question. I entered the command exactly as it is listed above and got an Ok back but the MTU did not change. Am I supposed to put the "" around Local Area Network in this command? Thanks for your help!

    2009-03-06 07:34:52 (AceDSL See Profile)

  • If you get element not found your not specifying the right subinterface (i.e. network connection). If you are using a wireless connection, use netsh interface ipv4 set subinterface "Wireless Network Connection" mtu=xxxx store=persistent

    2008-08-26 01:28:16 (Steven_M See Profile)

  • It worked fine for me, but maybe because I didn't know what I was supposed to do. I went into the Control Panel, opened Administrative Tools, opened System Configuration, Tools, Command Prompt & entered the informtion as instructed, then did it again changing the xxxx to 1500 so it actually worked.

    2008-07-11 20:06:54 (WGBlasdel See Profile)

  • Right click on the command prompt and select RUN AS ADMINISTRATOR

    2008-04-30 12:28:47 (Irish Shark See Profile)

  • I get Element not found

    2008-01-14 18:22:40 (james579 See Profile)

  • I have ran this comand and the result was a message "elevation is required". I was in admin login. What can i do?

    2008-01-08 09:28:12

  • You need to run cmd as Administrator.......

    2007-12-27 12:49:17 (wgn_peace See Profile)

  • The following .dll helper cannot be loaded iA109a-k13-3zxd-bape-TE Is there a fix for this.

    2007-11-15 20:55:54 (cmharmon See Profile)

  • get message that .dll helper cannot be loaded is there a fix for this.

    2007-11-01 21:35:51 (louis666 See Profile)

  • When I try to do this my vista says "the operation requires elevation"? :O

    2007-11-01 19:50:37



Expand got feedback?

by redxii See Profile
last modified: 2009-10-24 02:32:50