How to Check the MTU Settings

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How to Check the MTU Settings
The router's MTU settings control the maximum data packet size sent across the network. (Hemera Technologies/AbleStock.com/Getty Images)

The maximum transmission unit, or MTU, is the byte-size of the data packets sent across computer networks. If the MTU setting is not high enough, data packets are fragmented before being sent. Fragmented packets degrade the efficiency of data transmission and decrease the speed of data transmission. Some online services require minimum MTU settings to operate effectively. Check your MTU settings by logging into your router as the administrator.

Skill level:
Moderately Easy

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Things you need

  • Router

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Instructions

    Router

  1. 1

    Log into the router as the administrator. You must have the login ID and the password. Consult the router's user manual for exact steps to access the router administrative functions. Most routers enable access to the router's settings through your Web browser.

  2. 2

    Navigate to the network settings page, typically in an "advanced settings" tab in the router interface.

  3. 3

    Locate the MTU settings field. Depending on the brand and model of the router, the field may read "MTU settings," "MTU size" or just "MTU." If the MTU field is "enabled" -- some routers require enabling before MTU is displayed -- the MTU will be listed as a number. To enable your MTU settings, click the radio button or check-box next to the MTU field marked "enable."

  4. 4

    Read the MTU setting. The numerical value is the maximum value of the MTU in bytes of data allowed to be sent through the router.

Tips and warnings

  • Review the Resources section links to optimise your MTU settings.

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