[quicwg/base-drafts] Lost Server Initial Takes Too Long to be Retransmitted (#3078)

Nick Banks <notifications@github.com> Fri, 04 October 2019 00:24 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 805191208A2 for <quic-issues@ietfa.amsl.com>; Thu, 3 Oct 2019 17:24:32 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.382
X-Spam-Level:
X-Spam-Status: No, score=-6.382 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S1xN6fOCcVR8 for <quic-issues@ietfa.amsl.com>; Thu, 3 Oct 2019 17:24:30 -0700 (PDT)
Received: from out-19.smtp.github.com (out-19.smtp.github.com [192.30.252.202]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B8526120889 for <quic-issues@ietf.org>; Thu, 3 Oct 2019 17:24:30 -0700 (PDT)
Date: Thu, 03 Oct 2019 17:24:29 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1570148670; bh=xFJdNNALuFLQ67HpvkmWK6cE7aXxaV/qUOiyIh5eIsc=; h=Date:From:Reply-To:To:Cc:Subject:List-ID:List-Archive:List-Post: List-Unsubscribe:From; b=xMhJQWioNFF7zTY/Daa6e2ZUkEv4R/XRJOVlvMY0AHVyky0UsuwRM7ji6MloulaXV rwcIxpaMUK/iBCtRZFz6DodRgqONusDwHR3iGN31y5wBZYlE5yZc/veIKcYSRC4s1b iePFaVM4eo6zV6nDEXmypE39uuM5X00A+YCTJTxQ=
From: Nick Banks <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK2ZWXSIGUH4FPGSTFN3UPI43EVBNHHB34LR2Y@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/3078@github.com>
Subject: [quicwg/base-drafts] Lost Server Initial Takes Too Long to be Retransmitted (#3078)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5d96913deaaf3_74223fd8d72cd964229596"; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: nibanks
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/BGBLyaTPqcY9aHv6mSXVRHrCT3s>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 04 Oct 2019 00:24:33 -0000

Generally, the server's first flight (of a 1-RTT connection attempt) has a single Initial packet and the rest is made up of 1 or more Handshake packets. If the UDP datagram containing the Initial packet is lost, the server only ends up retransmitting it based off the default RTT based PTO timer.

If/when the client receives the Handshake packets that it can't decrypt (because the Initial was lost) then it has a (possible) signal that the server has responded, but a packet was lost. The client could use this info to immediately retransmit its Initial. If/when the server receives this, it could use this info to retransmit its Initial.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/3078