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Re: [PANRG] About Keith and Michael's proposal on sidecar protocols in PANRG today

"Holland, Jake" <jholland@akamai.com> Fri, 25 March 2022 17:51 UTC

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From: "Holland, Jake" <jholland@akamai.com>
To: Michael Welzl <michawe@ifi.uio.no>, Nicolas Kuhn <nicolas.kuhn.ietf@gmail.com>
CC: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "panrg@irtf.org" <panrg@irtf.org>
Thread-Topic: [PANRG] About Keith and Michael's proposal on sidecar protocols in PANRG today
Thread-Index: AQHYP9GUsz1IlfnJRUC7FYrfTalWv6zQCWeAgABb/4CAAAnLAP//wMkA
Date: Fri, 25 Mar 2022 17:51:30 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/panrg/mDnJSK9gwtGNKmzZ-WGPiLsuewg>
Subject: Re: [PANRG] About Keith and Michael's proposal on sidecar protocols in PANRG today
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On 03-25, 7:38 AM, "Michael Welzl" <michawe@ifi.uio.no> wrote:
> this sounds like we’re on the same page. I think being able to saturate capacities should be our primary goal, and maybe we should *really* care about long-term fairness in Congestion Avoidance once we have real-life sightings of this strange beast again (a CA phase that lasts more than a handful of round-trips, maybe even competing for capacity with anything).
> 
> But yes… we can surely add complexity to be theoretically sound  :-)

Of course, passing information about MP to an on-path proxy
introduces a new kind of information leakage that might pose a
privacy concern (especially if detailed rate or cwnd information
about alternate paths is needed), since MP is sometimes cited as
a possible mechanism to defeat on-path traffic analysis.

So there may be a tradeoff here between CC fairness and privacy
considerations.  Hopefully the discussions will either find an
uncontroversial solution that makes everyone happy or give us
some important new understanding about concerns in path-aware
networking (or both).

HTH.

-Jake

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