Re: Some questions related to "last segment" of a ddp message

On Jan 16, 2004, at 10:46 AM, Michael C. Cambria wrote:

>
>
>> So the way I read the draft, I can't find text that says one cannot 
>> send
>> overlapping DDP segments.
>
> This should have been "the way the draft reads".  My reading (which is 
> incorrect) ruled out overlaps.
>

To be precise, there are two distinct issues. Can a sender create
overlapping segments within a message, and whether the receiver
is under any obligation to check for this.

 From the sender's perspective, the TO SHOULD be in ascending
order and segmentation SHOULD be based upon the PMTU. Shifting
from the obvious segmentation strategy is legal, but only if
the sender has a valid reason for doing so. Given that overlapped
messages does not produce a predictable result there can be no
valid reason for doing this.

On the receiving end, this is something that the receiver
SHOULD NOT be checking.