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With the development of computer technology, embedded TCP/IP protocol stack has become an important part of the network information intelligence. Considering the structure features of the embedded TCP/IP protocol stack, this paper discusses the specific implementation procedure of the protocol stack network interface layer. The datagram module of RTL8019AS controller and the Ethernet data sending module are designed to achieve the network communication. It is shown that the system design was accomplished and it can be introduced to the practical usage in the real life.