How many bytes should a CRC-32 protect?

I was asked by someone how big a frame size can a CRC-32 reasonably protect?

One of my students came across:

http://sd.wareonearth.com/~phil/jumbo.html

which seems to suggest that the CRC-32 is good for 10-12KB or so of
data, and that
this could be one reason why we don't see many subnetworks supporting
MTUs > 12KB.

Is there more wisdom out there on the use of CRCs over large subnetwork PDUs?
- perhaps the ATM or gigEthernet people have thought this one through?


Gorry Fairhurst.