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Some PPPoE software, like Enternet (not Ethernet) and WinPoet, will not allow for higher than 1454 IPMTU. This, then, would be the number that all PCs will use.
If you use ICS (MSFT's Internet Connection Sharing software), then it is important to set ICS MTU for each PC to match that of the other machines as well. This can be done using DRTCP from the Tweaks Forums "Links."
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