I think this is a good idea, just some minor comments.
The draft says that the checksum will usually be constant for a UDP
flow. This is nice. For some tunnels it can even be computed at
configuration time (when the end-points are determined). I guess
the main case where this isn't the case, is when some datagrams
are fragmented but not all).
Regarding middleboxes. It says:
o Middleboxes SHOULD NOT truncate IPv6 datagrams where the IP length
exceeds the Length specified in the UDP Header.
I guess some middleboxes might currently also just discard them? Or
maybe discarding is a kind of truncation :) I also wonder whether it
would be better to say MUST? At least they cannot support UDPTT unless
it is a MUST. Or at least a MUST when the length is 8.
Stig
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