Ethernet Sending Individual Bytes

Hello,
I have been wondering if it is possible to send individual bytes as is along an ethernet connection with the standard Arduino Wiznet chip? Or does the chip integrate the payload data from the Arduino board into an ethernet packet and send that, already mixed with the preamble, start of frame delimiter, etc?

Thanks

You can send individual bytes in the packet payload, but the packet still needs a header, so the answer is no.

Oh... Because I was interested in experimenting with the actual ethernet data protocols itself, but it seems Arduino is not the way to do it.
Thanks for your help

I don't know what ethernet protocol you can use that doesn't need a header.