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> Is there a good test to determine when this lossage exists?
> BTW, Why is the Ethernet CRC not a sufficient error check?

The ethernet CRC is probably better at detecting certain error
patterns than the internet checksum, it's just that:

 0) the ethernet CRC is link-level, not end-to-end, which means that
if there's a router or store&forward bridge in the way with a flaky
memory chip in its packet buffers, the internet checksum has a chance
of detecting the error, while the CRC couldn't catch an error not
introduced by the wire..

 1) IP runs over other media than just Ethernet; some of the other
media doesn't have a link-level checksum (e.g., slip)

 2) it's usually computed by the interface card, not the host; having
a checksum computed in the host means that insanity in the card is
more likely to be detected.

See the famous journal article "End-to-end Arguments In System Design"
by Jerry Saltzer and someone else who's name escapes me at the
moment..

Bottom line:

If everything you want to talk to is on the same physical ethernet
segment, then, fine, turn off IP-layer checksums.

Anything else, I'd want to avoid playing with fire..

				- Bill

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