Re: Packet Loss Signaling for Encrypted Protocols - draft-ferrieuxhamchaoui-tsvwg-lossbits

[Mikkel Fahnøe Jørgensen <[e-mail]>]

The Q Period needs to be chosen carefully, since the observation could
become too unreliable in case of packet reordering and loss if Q Period is
too small. However, when Q Period is too large, short connections may not
yield a useful upstream loss measurement.

Wrt. short connections, do you mean low-latency, small RTT, or short-lived?

While this looks interesting, can you explain how the objectives compete or
differ from the spin bit, and quality and information provided?

Mikkel



On 9 July 2019 at 06.45.42, Lubashev, Igor ([e-mail]) wrote:

Alexandre, Isabelle, and I have posted a draft on a method for endpoints to
signal packet loss to the path, while maintaining end user privacy and
resisting ossification. The method is protocol-independent, but of course
you get the most benefit by applying the method to encrypted transports,
and QUIC is what people usually think of first in such context.

The draft is not targeted at the QUIC WG specifically, since it is
describing a general method of such loss reporting. But we do mention QUIC,
so the WG may find it interesting. We would welcome feedback from the QUIC
WG.

Lars, Mark, I am sure the meeting agenda for Montreal is pretty tight, but
if the WG is interested, we are happy to have a quick QUIC-specific
presentation on this.

Thank you!

- Igor

P.S. We've implemented this proposal in some Akamai servers and have been
using it to serve actual end-user QUIC traffic for a subset of Orange
customers. Orange implemented a passive observer that used this signal to
detect and identify loss. We can share the high-level of the results and
will share the detailed analysis of the data and measurement techniques in
maprg.

---------------------

https://datatracker.ietf.org/doc/draft-ferrieuxhamchaoui-tsvwg-lossbits/

Abstract:
This document describes a protocol-independent method that employs
two bits to allow endpoints to signal packet loss in a way that can
be used by network devices to measure and locate the source of the
loss. The signaling method applies to all protocols with a protocol-
specific way to identify packet loss. The method is especially
valuable when applied to protocols that encrypt transport header and
do not allow an alternative method for loss detection.