Le 15/12/2021 à 19:56, Templin (US), Fred L a écrit :
Alex,
A new feature in an ALv2 would be that instead of just a
frag-reassembly from sender to receiver, one would consider
group-degroup of packets too, to reduce overhead. If this too is
not already there in ALs.
The adaptation layer is that layer below the network layer but above
the data link layer. The group-degroup functions you are referring to
would apply at the adaptation layer send-side entry or receive-side
exit.
Yes, from a topology perspective that's where 'group-degroup' could sit.
From an ISO layer perspective a 'group-degroup' would probably sit in an
adaptation layer, below IP and above data link layer.
A 'group-degroup' function can also be seen in the jumbogram software
mechanism, rather than in the frag-defrag mechanism. The jumbogram
seems to be in the app layer (ApL?) whereas frag-defrag in the
adaptation layer (AdL?).
This makes wonder whether a group-degroup function would go into ApL or
rather in the AdL?
Whether or not the modern QUIC, rather than the older UDP and TCP,
includes a jumbogram mechanism and potentially group-degroup functions
could be explored. Because IPv6 jumbograms are specified for TCP and
UDP (RFC2675 "jumbograms"), but not for QUIC. This could further hint
on which layer is best for a group-degroup function, AdL or ApL.
Alex
Those
sorts of capabilities are already out in the wild in some systems,
but I have not seen a formal IETF spec yet. This seems like something
that could be mentioned in an adaptation layer spec.
Fred
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