Setting the optimal MTU inside of your router

TCAT Shelbyville - Technical Blog

How you find the optimal MTU settings is truly a matter of opinion.  Here is what we do…remember setting firewalls, routers and your computer will truly tweak out your connection.  Start on the outside and change your router or firewall first and then each computer (Use TCPOptimzer for computers).  Don’t forget access points and other devices.

  • Find an ISP or a website you can ping.
  • Ping the website from the command prompt (Windows) using the following command
  • ping -f -l 1472   (the -l is an “L” that is a lowercase and there is a space between each command and switch)
  • Hit the enter key
  • If you receive the message of fragmentation, reduce by 10 or 20 until you get responses.  Increase the number by 1 until you are 1 less away from getting a fragmentation message (midpoint – between high and low)
  • Now add 28 to this number…

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About TCAT Shelbyville IT Department

The Tennessee College of Applied Technology - is one of 46 institutions in the Tennessee Board of Regents System, the seventh largest system of higher education in the nation. This system comprises six universities, fourteen community colleges, and twenty-six Applied Technology Colleges.
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