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Anyone with enough hardware can observe this sort of problem:

http://www.evanjones.ca/tcp-and-ethernet-checksums-fail.html

When The CRC and TCP Checksum Disagree: http://conferences.sigcomm.org/sigcomm/2000/conf/paper/sigco...

Alternately, just look at "netstat -s" for any machine on the Internet talking to a bunch of others. Here's the score for the main web host of the Internet Archive Wayback Machine:

    3088864840 segments received
    2401058 bad segments received.



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