Finding Optimal MTU Size
Start with a high MTU value (say 1500)
ping www.google.com -n 1 -f -l 1500
If the response includes
Packet needs to be fragmented but DF set
then lower the -l value by 10 and re-test. Once you get a reply from your target address, increment the -l value by 1 until you cannot increment -l without receiving the above framentation message as a ping result.
This is your maximum MTU
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I had no idea what an MTU was. You inspired a quick trip to wikipedia and taught me something new. Thanks.