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