Re: [quicwg/base-drafts] max_packet_size in 0-RTT (#3447)

Martin Thomson <> Sat, 22 February 2020 23:01 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 0981A3A0A20 for <>; Sat, 22 Feb 2020 15:01:13 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.554
X-Spam-Status: No, score=-1.554 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, DKIM_VALID_EF=-0.1, HTML_IMAGE_ONLY_20=1.546, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (1024-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id h2f9jrav-dWM for <>; Sat, 22 Feb 2020 15:01:11 -0800 (PST)
Received: from ( []) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by (Postfix) with ESMTPS id C19473A0A18 for <>; Sat, 22 Feb 2020 15:01:11 -0800 (PST)
Date: Sat, 22 Feb 2020 15:01:10 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=pf2014; t=1582412470; bh=Y79n3/iQra0KSWK0AvloT73mRmqG4mOoDJL7ISxZQRo=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=EX5fAd1xeeUWFYzhNkSC9YBVnBzXOASv2xMP6vViAHj2tnEmVb6VCW7FkvxQ/4q9t vSHEftjX/j/sBZ8j876KePB3V3KTp8KcElgiD5fZcTg0AY8CMakiz4jFe7+Dki5uSj uvW1QpoER4AF22GMwzWiyksgRaMA5BgJh11c32lM=
From: Martin Thomson <>
Reply-To: quicwg/base-drafts <>
To: quicwg/base-drafts <>
Cc: Subscribed <>
Message-ID: <quicwg/base-drafts/issues/3447/>
In-Reply-To: <quicwg/base-drafts/issues/>
References: <quicwg/base-drafts/issues/>
Subject: Re: [quicwg/base-drafts] max_packet_size in 0-RTT (#3447)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5e51b2b6aec4b_1cc43fedf98cd96818793a"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: martinthomson
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
Archived-At: <>
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Sat, 22 Feb 2020 23:01:13 -0000

This is probably right.  The effect of exceeding this limit is most likely that the packet will be dropped.  So it looks like an MTU limitation that exists regardless of the path.

Encouraging clients to remember this is still the right thing to do though.  The alternative is terrible performance, as only some 0-RTT packets - the small ones - end up getting through.

You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub: