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Re: Expected Client Response to SERVER_BUSY

Töma Gavrichenkov <ximaera@gmail.com> Wed, 20 February 2019 15:04 UTC

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From: Töma Gavrichenkov <ximaera@gmail.com>
Date: Wed, 20 Feb 2019 07:03:49 -0800
Message-ID: <CALZ3u+Zmau+167msd9+OGcU+V00+__yLK83ByNEqvWhm7yFORg@mail.gmail.com>
Subject: Re: Expected Client Response to SERVER_BUSY
To: Nick Banks <nibanks=40microsoft.com@dmarc.ietf.org>
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>
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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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