From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.sms.unimo.it (smtp1.sms.unimo.it [155.185.44.147]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 7F3C621F228 for ; Mon, 27 Apr 2015 02:49:01 -0700 (PDT) Received: from [212.84.39.131] (port=51520 helo=[192.168.15.101]) by smtp1.sms.unimo.it with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1Ymfem-00088z-3u; Mon, 27 Apr 2015 11:48:57 +0200 From: Paolo Valente Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Date: Mon, 27 Apr 2015 11:48:44 +0200 To: bloat Message-Id: Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) X-Mailer: Apple Mail (2.1878.6) UNIMORE-X-SA-Score: -2.9 Subject: [Bloat] Detecting bufferbloat from outside a node X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Apr 2015 09:49:30 -0000 Hi, a network-monitoring company got curious about bufferbloat issues and = asked me to investigate a little bit the following issue (quite = interesting in my opinion). Is it possible to detect, from outside a = node, if the node is bufferbloated? In particular, the only action = allowed would be to observe the packets entering and leaving the node = (plus, of course, their timing). If such a general problem is to hard or impossible to solve, do you = think it is still possible at least to understand, for some type of = application, if the application is experiencing a high latency because = of bloated buffers inside the node? (As above, by just observing packet = flows from outside the node.) Thanks, Paolo