Alex,
there are lots of IP-over-foo documents that have much more logic than
6LoWPAN.
-- the PPP series of documents, which by reference includes functions
like ROHC (which has its own segmentation layer);
-- IP over ATM?
-- and how about MPLS (which also includes ROHC via RFC 4901);
-- and an example for something quite similar to 6LoWPAN (including
fragmentation), RFC 3146 (IPv6 over Firewire)/RFC 2734 (IP over
Firewire).
This is why I don't understand the goal of specifying 6LoWPAN
fragmentation at a layer situated below the IPv6 layer.
It is a bit late to make that argument:
RFC 4919 (defining that goal) and RFC 4944 (specifying the protocol)
were approved in 2007.
Gruesse, Carsten
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