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[ih] why did CC happen at all?

> So that weak 16 bit UDP checksum can help catch this stuff.  I wonder
> how many corrupted files were created with NFS and broken ethernet
> hardware?

Lots and lots.

At one point, a late generation of BBN Butterfly computers had a low voltage
problem on a bus that would cause some bytes of a DMA from network adapters
to be garbage.  Trashed the NFS filesystem, as I recall, about once a week.