How to Increase the Frame Size From 1514 to 9000

Written by jason artman
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How to Increase the Frame Size From 1514 to 9000
An Ethernet cable looks like a telephone cable, only wider. (Ethernet crossover cable image by lefebvre_jonathan from

Ethernet is a common system used to network computers. Each packet of information sent over an Ethernet network is called a "frame," and originally, the Ethernet specification called for a size limit of about 1,500 bytes for each frame of information. However, if you are on a high-speed "gigabit" network, your network might support much larger frames called "jumbo frames," up to 9,000 bytes in size. You can change the Ethernet frame size from the command prompt in Windows 7, and doing so may increase the speed at which your home or business network transmits data.

Skill level:

Things you need

  • Windows 7 or Windows Vista

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  1. 1

    Click the Start icon and type the word "command" in the search box at the bottom of the menu. "Command Prompt" should appear on the list of results.

  2. 2

    Right-click "Command Prompt" and select "Run as Administrator." Windows opens an elevated command prompt.

  3. 3

    Type "netsh interface ipv4 show subinterfaces" without quotation marks and press "Enter." Windows displays a list of each network connection configured on your computer. If you have just one Ethernet connection, the connection that you will change is called "Local Area Connection." If you have more than one Ethernet connection configured on your computer, find the connection that has numbers displayed under "Bytes In" and "Bytes Out." This is the connection that you use to get online, and it may have a name such as "Local Area Connection 2."

  4. 4

    Type "netsh interface ipv4 set subinterface "Local Area Connection" mtu=9000 store=persistent" and press "Enter." If you found a different name for your local area connection in Step 3, use that name instead of "Local Area Connection." This command changes the Ethernet frame size for the local area connection to 9,000 bytes.

Tips and warnings

  • Some Internet service providers do not support the use of jumbo frames. If you are unable to access the Internet after changing the frame size to 9,000 bytes, repeat the steps in this article, substituting "9000" for "1500 to change your computer's Ethernet frame size to its original value.

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