Transmission Control Protocol (TCP)
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W. Eddy · 2022-08
Abstract
RFC 9293 is the consolidated specification of the Transmission Control Protocol, superseding RFC 793 and incorporating forty years of clarifications, errata, and updates from over 20 subsequent RFCs. It provides a single authoritative reference for TCP implementers, resolving ambiguities that accumulated across the protocol's long history.
Why This RFC Matters
It took over forty years, but the IETF finally produced a consolidated TCP specification in RFC 9293. The original RFC 793 (1981) had been amended by dozens of subsequent RFCs — covering congestion control, security considerations, urgent data semantics, and other clarifications — leaving implementers to synthesize a scattered collection of documents. RFC 9293 gathers this into a single readable specification while promoting TCP to Internet Standard status. Its publication acknowledged that TCP, despite being one of the internet's oldest protocols, had never had a clean, complete standard — and that this gap had real consequences for interoperability and security. RFC 9293 is now the definitive TCP reference for all new implementations.