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Re: Exercising Version Negotiation

Roberto Peon <fenix@fb.com> Fri, 23 March 2018 21:00 UTC

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From: Roberto Peon <fenix@fb.com>
CC: IETF QUIC WG <quic@ietf.org>, Mike Bishop <mbishop@evequefou.be>
Subject: Re: Exercising Version Negotiation
Thread-Topic: Exercising Version Negotiation
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To: Ryan Hamilton <rch@google.com>
To: Eric Rescorla <ekr@rtfm.com>
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Wouldn’t it be best to do all 3 combinations? ☺
-=R

From: QUIC <quic-bounces@ietf.org> on behalf of Ryan Hamilton <rch=40google.com@dmarc.ietf.org>
Date: Friday, March 23, 2018 at 1:20 PM
To: Eric Rescorla <ekr@rtfm.com>
Cc: IETF QUIC WG <quic@ietf.org>, Mike Bishop <mbishop@evequefou.be>
Subject: Re: Exercising Version Negotiation

On Fri, Mar 23, 2018 at 1:48 AM, Eric Rescorla <ekr@rtfm.com<mailto:ekr@rtfm.com>> wrote:
On Thu, Mar 22, 2018 at 8:53 PM, Ryan Hamilton <rch@google.com<mailto:rch@google.com>> wrote:
Agreed. As specified, I don't see how the server would be induced to send a version negotiation packet in this case. Ekr, perhaps you can provide some sample flows. If the server supports versions A and B, and the client supports versions A and B, then it doesn't matter which version the client prefers. In either case, the server supports the version the client is attempting to speak and will not send a version negotiation packet.

I'm not suggesting that you flip the preferences, but rather that the each side configure itself with one version for a given connection. This is obviously trivial for a client. For the server, you can just hash the client's IP address to get a stable choice.

​Ah, I misunderstood what you meant by, "We would then suggest to people that they somewhat randomize their preferences (e.g., 99% of the time prefer v1+i, 1% of the time prefer v1-i)."

How would you envision this working with Alt-Svc advertisements? Would the server advertise support for both versions but only support a single one, or would it advertise only the single version?

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