Detect Incorrect Checksum

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Hi all,

I have some hosts (windows and Solaris) connected to Cisco Switch 2950.

When i capture traffic with sniffer, i can see a problem of incorrect
checksum in packet and i know why (i disabled offload in my network card and
all work fine).

But when i have checksum error, i don't see anything in the switche. (no
input, no output, no crc... no errors) !!!

How can i detecte checksum error whitout sniffing directly in the hosts ??

ThankYou very much

Best Regards

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