Testing for MTU
Follow these steps to find a suitable MTU:
ATTENTION
Do NOT spend hours
pinging your ISP's servers as he will get annoyed with you. It is
un-necessary server load and is poor etiquette. You only need to
do this once to confirm the value before proceeding.
- Firstly, ask yourself "Is my line
quality good?". If you get connection speeds well
below the speed of your modem then you probably have a
poor line. If you connect at your full modem speed most
of the time you probably have a good line.
- If you have a poor line you should use a
small MTU. If you have a good line you should use the
largest MTU you can get away with.

Choose if you have a poor or good line.
You MUST have ping on your computer for this to work.