: As of April 2026, it remains an active Internet-Draft within the IETF, with reference implementations available for Linux (TCP) and Apple (QUIC). 2. Prague, Czech Republic: Travel & Culture
draft-briscoe-iccrg-prague-congestion-control-04 - IETF Datatracker Prague
Prague is globally renowned for its history, architecture, and its foundational "draft" beer culture. : As of April 2026, it remains an
: Implements a "virtual RTT" to prevent flows with very low Round-Trip Times from dominating others. : Implements a "virtual RTT" to prevent flows
: Sources must set the ECT(1) codepoint in the IP header to identify as L4S-capable.
: Requires a more granular feedback mechanism than standard TCP to react to the extent of congestion rather than just its existence .
The is a scalable congestion control mechanism designed for the L4S (Low Latency, Low Loss, and Scalable Throughput) architecture.