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#1
November 19th 05, 06:22 PM
posted to microsoft.public.win98.networking
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UDP checksum calculation - uses lenght twice ?
I had some trouble understanding the UDP-packet checksum calculation, as is
described here : http://www.netfor2.com/udpsum.htm . For some reason the checksum uses the size of the packet twice : once in the real UDP packet, and once in the pseudo-header (containing the sending & receiving IP, as well as the protocol). It made me think I overlooked/did not understand something ... Does anyone know why this is done ? Regards, Rudy Wieser 
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