The Embedded Implementation Of TCP/IP Protocol

At present, TCP/IP protocols are network protocols, which are used most extensively and can run on different network. But Ethernet technology is a LAN technology, which is used most extensively. This paper is about how to effectively implement TCP/IP protocols on embedded systems on base of Ethernet technology.At first, the responsibility and mutual relation of these protocols in TCP/IP protocols are introduced hierarchically.Then the chief protocols in each layer are implemented hierarchically just like those protocols are developed hierarchically. In link layer, the procedure of data transmission between the chief chip and interface chip is described at large. At the same time, the operational principle of ARP is exposed very clear and the flow diagram for implement is provided thoroughly. In network layer, IP is simply implemented comparatively, only encapsulation and demultiplexing are implemented. The principle of algorithm for checksum is exhausted . The function of echo request and reply is implemented only for the adjective ICMP. On the other hand, emphasis is placed on the description of the principle of TCP, especially on the procedure of establishment and termination of linking, what's more, the diagram of status of a link is provided. There are many protocols in application layer, which is related with especially application. Here, two protocols, HTTP and modbus specification, are implemented.