Re: UDP checksum calculation - uses lenght twice ?

Yes , you have to do that , read about that in RFC793
Arkady

"R.Wieser" <address@xxxxxxxxxxxxx> wrote in message
news:Ow5QTIS8FHA.736@xxxxxxxxxxxxxxxxxxxxxxx
> Hello all,
>
> 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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