ping -f -l 1472

  tonyx1302 17:08 18 Feb 2008

My ISP..Eclipse..have just emailed me to say that to aquire my max MTU : ping -f -l 1472 click here then follow instructions from their email. How/what do I go about this please. I have tried putting it into web address but nothing happened.


  VoG II 17:14 18 Feb 2008

Start, Run, type


and click OK.

Type the command at the > prompt and press Enter.

  tonyx1302 17:24 18 Feb 2008

Thanks VoG for that.I did as suggested and have been told that 'packet needs frag but DF set'.
Any suggestions please ?


  brundle 17:25 18 Feb 2008

Reduce the number until you get a successful ping. Drop by say, 32 at a time

  brundle 17:26 18 Feb 2008

When you get a successful ping, keep trying and raise the number until it fails. That is your `ideal` MTU (the one just before it fails).

  beeuuem 17:43 18 Feb 2008

Try TCPOptimizer from click here The tab 'largest MTU' will tell you your optimum setting.

  tonyx1302 17:49 18 Feb 2008

Many thanks VoG/brundle. I have taken beeuuem post on board and used TCP which gave me a MTU of 1458 instead of the preset 1500

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