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Main >> Support >> ADSL Resize MTU Feedback

What is MTU and why is my ADSL connection playing up?

The Maximum Transmission Unit (MTU) is the maximum piece of data that your computer can send to another computer. The two communicating computers must agree on an MTU by comparing MTU sizes and selecting the smaller of the two.

If the MTU is set too large for routers that are between the computers, these routers then fragment (break apart) this information into a size that it can handle.

Sometimes when this fragmentation occurs Internet data does not arrive at it's destination, causing problems such as some websites not to display, slow connection speeds and other difficulties.

This problem can be solved by adjusting your computer or modems MTU size.( For detailed instructions on adjusting your modems MTU size, please refer to your ADSL modem manual). If your ADSL modem does not support adjusting the MTU you will need to alter some settings on your computer. ISPDr recommends the use of DrTCP, a freeware program that allows you to adjust your MTU and other connection settings.

  1. Click Here to Download DrTCP and save it somewhere on your PC for easy access - like your desktop.
  2. You will need to then run the application by double clicking on the DrTCP icon.
  3. Select you network card (1) from the 'Adaptor Settings' drop down box.
  4. Enter the value 1420 in the MTU field (2) as displayed in the image below.
  5. Click Save.
  6. After you get confirmation of the settings being saved, restart your computer for the changes to take affect.
  7. Your ADSL connection issues should now be solved.

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