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TCP/IP check sum

2001-08-28 01:10:03
Hi,
On a etherent frame CRC is used for error detection.
For TCP/IP frames frame check is done by using 16bit
1's complemet addtion.
Why is TCP/IP frame check required when the same is
verified by the ethernet MAC?
What is then the motivation of providing TCP/IP
checksum overload by some products?

Waiting for responses.
thanking you,
jacob

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