ChronotechAn atlas of how we made the world

Communications · Vol. VI|Packet internet|1969 (ARPANET); 1983 (TCP/IP cutover)

Packet internet

1969 (ARPANET); 1983 (TCP/IP cutover)

ARPANET’s first login, UCLA to Stanford in 1969, crashed after two letters. The idea survived: break a message into packets, send them independently, reassemble at the end. TCP/IP, on 1 January 1983, became the common tongue. The internet is not a wire. It is an agreement about envelopes.

ARPANET teams; Cerf, Kahn, and many others · United States, then global research nets

Packet internet — Original plate drawn for this atlas. Not a photograph of a museum object or a copyrighted portrait.

How the mechanism is arranged

Packets hop. There is no single path from A to B — only a graph of machines that forward fragments.

How it works

Split data into packets with addresses.
Routers forward each packet hop by hop.
The destination puts the packets back in order and asks for missing ones.

Why it mattered

Survived the loss of any one path.
Let unlike networks interconnect.
Became the substrate of the web, mail, and phones.

Who turned the wheel

b. 1955Tim Berners-Lee

What it unlocked

For further study

Kleinrock / UCLA accounts. First ARPANET node.
Hafner and Lyon, Where Wizards Stay Up Late. Narrative.

Check

What advantage do packets have if one link fails?