How to learn network Ethernet device driver programming?

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I am looking what piece of hardware should i buy (NIC Or FPGA Or ASIC etc) which i could connect to my system, and write device driver to implement and learn Ethernet device driver typical functions like - packet trapping/ receiving and sending packet/ reprogramming the hardware etc ? How can i learn all this stuff at home ?

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linuxfan says Reinstate Monica On

I think that if your "system" is a computer, it should have a NIC (or you can buy one). Anyway, you need a computer to write a driver... so download the kernel sources and look at the driver source for the NIC you are using.