[xcp] Notes from XCP meeting at ISI

[John Wroclawski]

>
>	-- NOTE: The XCP header is currently not covered by ANY checksum!!
>		We should probably fix this!
>
>	-- Ted asked: if XCP header checksum fails, what do you do?
>		Bob argued: better drop the packet, to prevent a simple
>		attack on XCP.
>

ah, our friend the per-node re-checksum.

should the spec explicitly consider, and say something, for/against 
incremental update?