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QUIC offers security and privacy for modern web traffic by closelyintegrating encryption into its transport functionality. In this process, ithides transport layer information often used for network monitoring, thusobsoleting traditional measurement concepts. To still enable passive RTTestimations, QUIC introduces a dedicated measurement bit - the spin bit. Whilesimple in its design, tracking the spin bit at line-rate can become challengingfor software-based solutions. Dedicated hardware trackers are also unsuitableas the spin bit is not invariant and can change in the future. Thus, this paperinvestigates whether P4-programmable hardware, such as the Intel Tofino, caneffectively track the spin bit at line-rate. We find that the corefunctionality of the spin bit can be realized easily, and our prototype has anaccuracy close to software-based trackers. Our prototype further protectsagainst faulty measurements caused by reordering and prepares the dataaccording to the needs of network operators, e.g., by classifying samples intopre-defined RTT classes. Still, distinct concepts in QUIC, such as itsconnection ID, are challenging with current hardware capabilities.

Tracking the QUIC Spin Bit on Tofino