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RE: Expected Client Response to SERVER_BUSY

Nick Banks <nibanks@microsoft.com> Wed, 20 February 2019 15:19 UTC

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From: Nick Banks <nibanks@microsoft.com>
To: Töma Gavrichenkov <ximaera@gmail.com>, Ian Swett <ianswett@google.com>, "Brian Trammell (IETF)" <ietf@trammell.ch>, IETF QUIC WG <quic@ietf.org>, Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>
Subject: RE: Expected Client Response to SERVER_BUSY
Thread-Topic: Expected Client Response to SERVER_BUSY
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Date: Wed, 20 Feb 2019 15:19:54 +0000
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I want to support something a bit more efficient than simple rate limiting and packet drops. The client might have relatively large timeout in that case before falling back to TCP. If possible, I want to be able to give an immediate indication that it should try to fallback.

- Nick

-----Original Message-----
From: Töma Gavrichenkov <ximaera@gmail.com> 
Sent: Wednesday, February 20, 2019 7:04 AM
To: Nick Banks <nibanks@microsoft.com>
Cc: Ian Swett <ianswett@google.com>; Brian Trammell (IETF) <ietf@trammell.ch>; IETF QUIC WG <quic@ietf.org>; Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>
Subject: Re: Expected Client Response to SERVER_BUSY

On Wed, Feb 20, 2019 at 6:50 AM Nick Banks <nibanks=40microsoft.com@dmarc.ietf.org> wrote:
> It would be nice to have a way for the server to say “QUIC is 
> temporarily unavailable right now, please go use TCP instead.”

One issue here is that under a DDoS attack an ISP would just apply selective blackholing or flow specification which would simply drop all the incoming UDP traffic to protect the last mile. Depends on the attack pattern somewhat, sometimes blackholing might be more granular, but all in all you should expect that.

The only hope here is that a client would interpret response timeout in the same way as SERVER_BUSY.

--
Töma

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