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Well that's the thing, for the real world the L3's MTU is limited by the L2 MTU.

Well that's the thing, for the real world the L3's MTU is limited by the L2 MTU. If you can guarantee L2 MTU will be fixed and known for every device along the path then there is not really a need for a variable L3 MTU anymore and you've solved the problem by convincing everyone in the world they'll never need or want a different MTU again. Then someone gets the bright idea they can do something with tunnels and it starts back up. If you want a world where you can rely on an L2 to have a way to handle the MTU mismatch then nothing is being solved by this other than the ability to say "fragmentation is not not in the current abstraction layer anymore, it's now an annoying problem on the layer below it instead" :).

Posted by zamadatix on Feb 17, 2024, 8:25 PM

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Well that's the thing, for the real world the L3's MTU is limited by the L2 MTU.

zamadatixFeb 17, 2024, 8:25 PM

Well that's the thing, for the real world the L3's MTU is limited by the L2 MTU. If you can guarantee L2 MTU will be fixed and known for every device along the path then there is not really a need for a variable L3 MTU anymore and you've solved the problem by convincing everyone in the world they'll never need or want a different MTU again. Then someone gets the bright idea they can do something with tunnels and it starts back up. If you want a world where you can rely on an L2 to have a way to handle the MTU mismatch then nothing is being solved by this other than the ability to say "fragmentation is not not in the current abstraction layer anymore, it's now an annoying problem on the layer below it instead" :).

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