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Re: TCP/IP check sum

2001-08-28 01:40:02
I know some products and implementations that do not do ethernet error
correction...

Cheers.
Franck(_at_)sopac(_dot_)org

----- Original Message -----
From: jacob mathews <jac_mat_ietf(_at_)yahoo(_dot_)co(_dot_)in>
To: <ietf(_at_)ietf(_dot_)org>; 
<UNEXPECTED_DATA_AFTER_ADDRESS(_at_)(_dot_)SYNTAX-ERROR>
Sent: Tuesday, 28 August 2001 20:05
Subject: TCP/IP check sum


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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