A study of the active router structure

Active network is a new framework where network nodes not only forward packets, but also perform customized computation on the packet flowing through them. It provides a programmable interface to the user where users dynamically inject services into the intermediate nodes. This paper bring forwards a structure of active router based on IP network, analyses the extended definition field of IP datagram and the format of the active IP datagram, researches the module structure, the logic flow chart and the arithmetic of active router, thereby realizes the active networks technology in IP network and extends the service in existence network.