From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gatekeeper1-relay.space.net (gatekeeper1-relay.space.net [IPv6:2001:608:3:85::38]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id A1EAE3B29E for ; Mon, 24 Oct 2022 16:54:50 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=space.net; i=@space.net; q=dns/txt; s=esa; t=1666644891; x=1698180891; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=P66+lOe+DeYAww+77Z7rbqvwepBaY2yj1+VotPItIV0=; b=Zq4C6BMQeGc3nQAOE1Ixn61GVVHOa0S6gF54GCeuT2J9RghltoGb2Wab 49AHP8RRW9OYfFfkEi5N0CixCXYycmBQQuDY2C1lNtHJ6XOHs0vdvDjKT g6F3q4FwJDZWa2mz5q+VaTGNN/jGWJufqHxS30l6xR0WBclXIjbjs827v y0MDdqR2XkketDFbLqce53ztzX4PCB3jSU4ATYSquev4Gwi//ESO1iBxF AiJKbUwbZe07uv/4IXQ2chus7pOeO2TeyQ9ue3MABw8qAD2TsCQYi226F VoEPG9M2QYd7b5BLAEaHDpviVGuaZi6aTUazpFh3j5cJJ2nzLFJ0k812N A==; X-SpaceNet-SBRS: None Received: from mobil.space.net ([195.30.115.67]) by gatekeeper1-relay.space.net with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Oct 2022 22:54:49 +0200 Received: from mobil.space.net (localhost [IPv6:::1]) by mobil.space.net (Postfix) with ESMTP id 80A604246C for ; Mon, 24 Oct 2022 22:54:48 +0200 (CEST) X-SpaceNet-Relay: true Received: from moebius4.space.net (moebius4.space.net [IPv6:2001:608:2:2::251]) by mobil.space.net (Postfix) with ESMTP id 3583B40AD0; Mon, 24 Oct 2022 22:54:48 +0200 (CEST) Received: by moebius4.space.net (Postfix, from userid 1007) id 2C17811394B; Mon, 24 Oct 2022 22:54:48 +0200 (CEST) Date: Mon, 24 Oct 2022 22:54:48 +0200 From: Gert Doering To: David =?iso-8859-1?Q?Fern=E1ndez?= Cc: starlink@lists.bufferbloat.net Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Subject: Re: [Starlink] Packet losses in a router X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Oct 2022 20:54:51 -0000 Hi, On Mon, Oct 24, 2022 at 10:13:35PM +0200, David Fernández via Starlink wrote: > Dear participants of this list, > > If you had a router that in lab conditions, with Gigabit Ethernet > interfaces, that losses 1 or 2 out of a few thousands of UDP packets > of a few hundreds of bytes each one, during a test of 1 minute, at > only 50 packets/s using iperf2, I am sure that you would investigate > why, wouldn't you? If there isn't some reasonable explanation (like GigE -> 100M stepdown and bursty traffic overflowing buffers), there must not be loss. Never. When we test new circuits we do Cisco ping "sweep rate of sizes", which pings with 38...18000 bytes, 5 times - including fragments, this is very many packets. The expected result is "0 packet lost". (Arguably this test is only exercising the circuit half-duplex, so the notorious 100Mbit half-duplex / full-duplex mismatch is not caught, but any sort of one-way error is) Gert Doering -- NetMaster -- have you enabled IPv6 on something today...? SpaceNet AG Vorstand: Sebastian v. Bomhard, Michael Emmer Joseph-Dollinger-Bogen 14 Aufsichtsratsvors.: A. Grundner-Culemann D-80807 Muenchen HRB: 136055 (AG Muenchen) Tel: +49 (0)89/32356-444 USt-IdNr.: DE813185279