Before setting your MTU you must find it. To start with you should set your MTU to a high value. This way the following procedure will be accurate, i.e. If you MTU is currently 576 then the procedure won't find an MTU an larger than 576. Basically skip to the Setting MTU/TTL/RWIN section & set your MTU to 1500 or greater. Then Reboot for the changes to take effect, then return to this section. You will now be able to get an accurate indication of your MTU.
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