HTTP/3 needs us to make firewall changes

Re:HTTP/3 needs us to make firewall changes by wahern on Saturday June 05, 2021 @04:11AM (#27403208)

That all depends on the congestion control algorithm. Different implementations of TCP can use different algorithms while still being compatible. The same is true of QUIC.

The recently published QUIC standard specifies a tweaked version of TCP NewReno. See https://www.rfc-editor.org/rfc/rfc9002.txt and https://datatracker.ietf.org/doc/html/rfc6582 But AFAIU this is not the algorithm Google itself uses for QUIC, nor the one they used for their famous benchmarks showing latency improvements on mobile.

To derive maximum benefit (or even just most of the benefit) of a tailored congestion control algorithm, you'll want to control both sides, keeping them in sync as you iterate improvements and changes. And maintain different flavors for different application environments. Only huge companies like Google and Facebook will be able to do this effectively.

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Re:HTTP/3 needs us to make firewall changes by kevincox on Saturday June 05, 2021 @01:49PM (#27407133)

QUIC does have more than just different congestion control For example it has forward error correction which can be very important for lossy connections.

There are other improvements that can't really be added to TCP either such as roaming between IP addresses. (MPTCP exists but IIUC requires make-before-break which is not always possible).

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