 Between 1976 and 1977, Yogen Dalal proposed separating TCP's routing and transmission control functions into two discrete layers, which led to the splitting of TCP into the TCP and IP protocols, and the development of TCP/IP.With the role of the network reduced to a core of functionality, it became possible to exchange traffic with other network independently from their detailed characteristics, thereby solving Kahn's initial problem.DARPA agreed to fund development of prototype software, and after several years of work, the first demonstration of a gateway between the Packet Radio network in the SF Bay area and the ARPANET was conducted by the Stanford Research Institute.