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How to Determine optimal MTU setting for router

New version of this tutorial    • Find optimum MTU for Windows   This tutorial shows how to Determine optimal MTU setting for router. To change MTU value on Windows 7, 8 or vista PC or Laptop watch this tutorial    • Set / Change MTU setting in windows vista ...   -------------------------------------------------------------------------------------- Sometimes a strange problem occurs that do not let you open any other website but Google websites only. I had faced this problem and I always thought that there is an outage but when it started to happen very often I had to research and I found that it was due to wrong MTU settings. Here is a short tutorial on how to find best MTU settings for your router. MTU settings for better internet speed. How to determine the best MTU size to get better internet connection performance? Follow these steps: 1. In windows, click on "Start", right click on "Command Prompt" and run as Administrator 2. At the command prompt, type this command: ping www.google.com -f -l 1500 and press enter key 3. You may see "Packet needs to be fragmented but DF set." It means that the packet size needs to be fragmented. 4. Repeat above command with lower packet size value for example 1400 5. If you still get "Packet needs to be fragmented but DF set." message, repeat the command with even lower value until you get something like this "Reply from 173.194.36.112: bytes=1200 time=32ms TTL=55" 6. When you get a reply from above ping command try a little higher vale for example add 5 or 10 to the value until you find the highest value that does not fragment 7. Add 28 to the largest value that you have found which does not get fragmented. Result is the optimal MTU setting for you. I hope it helped you!