Mike Fedyk wrote:
I've noticed that too in some cases, and not just with AFS.
It seems that in at least some situations, tcpdump does not get to see the real UDP checksum that will appear on the wire for outgoing traffic. This is entirely dependent on how the operating system implements its packet tracing facility.
Does your ethernet card have hardware checksumming? Maybe tcpdump is getting the packets before the hardware has put in the checksums...
I don't know -- it seems a bit odd that most packets would have the correct checksum, but a few would not. -- Joe Buehler
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