Becoz a UDP packet is not "complete" unless it has all the payload.
If a UDP packet arrives, and the length says 10-octets, but there were
only 9, throw the packet away
No. UDP does not *require* that the packet be thrown away if it does
not match checksum or length. Lots of implementations do that, but it
is not required.
That's true. For checksum, 0x0000 is reserved for no-checksum-required,
but most (all ?) stacks don't pass on partial packets.
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