TCP/IP's pragmatic design still powers global networking
A columnist reflects on TCP/IP's nearly 40-year history and its remarkable scalability. The protocol's success comes from separating IP, which delivers packets on a best-effort basis, from TCP, which ensures reliable transmission. This split allows new protocols like Homa to operate alongside TCP rather than replace it.
In 1974, Vint Cerf and Bob Kahn published a 13-page paper outlining internetworking; ARPANET adopted TCP/IP nine years later, switching from NCP on January 1, 1983. By 1988, a programmer could build a working stack for new hardware in about three months, though IBM PS/2 Micro Channel driver work took longer.
The architecture separates IP's no-promises packet movement from TCP's ordered, dependable byte flow. That lets alternatives such as Homa coexist with TCP, rather than displace it, while TCP/IP outlasted rival approaches like IBM's SNA and telecoms' ATM.
Because TCP/IP underpins so much global communication, changes around it could affect nearly everyone who relies on internet services, from households to cloud providers. Network engineers and application developers may gain flexibility by running new protocols beside TCP, potentially improving performance in specialized settings. Yet dependence on this shared foundation also means that flaws, misconfigurations, or transition difficulties could ripple widely, making continued interoperability and careful testing important for society.