i would like to know how the network layer does to know what is the upper
layer protocol in order to fill in correctly the protocol field in the
header it adds to the packet before sending it. I'm doing a ethernet device
that doesn't add any header to the packet but change the output device,
then i should say the network device that the packet is like if it has been
sent by the ip protocol.
Thanks,
Romain Giry
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