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Chaging MTU Settings

By scr1b3
Apr 3, 2012
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  1. I found I don't receive this error "Packet needs to be fragmented but DF Set" when I do a " ping -f -l 1400 www.yahoo.com ". Then I set MTU to the the value of 1400 and reboot the machine. After reboot, I did a another " ping -f -l 1400 www.yahoo.com " and got "Packet needs to be fragmented but DF Set" error again. I lower the value again and another reboot, I get the same error.

    I think I'm doing some thing wrong here - Please help.
     
  2. jobeard

    jobeard TS Ambassador Posts: 8,956   +587

    As I recall, there's an 8 byte header, so if MTU is 1408, then ping -l 1400 should be clean.
     

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