IPv6 MTUs smaller than 1280 bytes?

Gert Doering gert at space.net
Sat Sep 11 21:09:06 CEST 2010


On Fri, Sep 10, 2010 at 05:36:52PM -0300, Fernando Gont wrote:
> I'm told that in some scenarios, IPv6 operates over link-layers that do
> not provide an MTU gretear than or equal to 1280 bytes (the IPv6
> required minimum MTU).

There seems to be quite some misunderstandings about link-layers like
ATM or X.25 that have a smaller segment size - but since those layers
do layer 2 segmentation/reassembly without the need of a reduced IP/IPv6
MTU, I don't see a problem there.

So if there's indeed link-layers that cannot handle 1280, I'd also like to
know more details :-)

Gert Doering
        -- NetMaster
Total number of prefixes smaller than registry allocations:  155817

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