From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-01-ewr.dyndns.com (mxout-089-ewr.mailhop.org [216.146.33.89]) by lists.bufferbloat.net (Postfix) with ESMTP id 5D8362E011F for ; Fri, 11 Mar 2011 11:11:01 -0800 (PST) Received: from scan-02-ewr.mailhop.org (scan-02-ewr.local [10.0.141.224]) by mail-01-ewr.dyndns.com (Postfix) with ESMTP id 986CE1F7E59 for ; Fri, 11 Mar 2011 19:11:00 +0000 (UTC) X-Spam-Score: 0.0 () X-Mail-Handler: MailHop by DynDNS X-Originating-IP: 149.20.68.5 Received: from mail1.ntp.org (mail1.ntp.org [149.20.68.5]) by mail-01-ewr.dyndns.com (Postfix) with ESMTP id 149941F88D3 for ; Fri, 11 Mar 2011 19:11:00 +0000 (UTC) Received: from mail-wy0-f171.google.com ([74.125.82.171]) by mail1.ntp.org with esmtpsa (TLSv1:RC4-SHA:128) (Exim 4.72 (FreeBSD)) (envelope-from ) id 1Py7jX-000LM3-3R for bloat@lists.bufferbloat.net; Fri, 11 Mar 2011 19:10:54 +0000 Received: by wyb32 with SMTP id 32so3409865wyb.16 for ; Fri, 11 Mar 2011 11:10:36 -0800 (PST) Received: by 10.227.169.77 with SMTP id x13mr416854wby.151.1299870636183; Fri, 11 Mar 2011 11:10:36 -0800 (PST) MIME-Version: 1.0 Received: by 10.227.210.140 with HTTP; Fri, 11 Mar 2011 11:10:16 -0800 (PST) In-Reply-To: References: <6210AF7E-3EB3-4199-A87B-A54B0F73A106@gmail.com> <20110311092157.23dea5e8@nehalam> <87d3lxr14w.fsf@cruithne.co.teklibre.org> From: Dave Hart Date: Fri, 11 Mar 2011 19:10:16 +0000 Message-ID: To: Jonathan Morton Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 74.125.82.171 X-SA-Exim-Rcpt-To: bloat@lists.bufferbloat.net X-SA-Exim-Mail-From: hart@ntp.org X-Spam-Checker-Version: SpamAssassin 3.3.0 (2010-01-18) on mail1.ntp.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.3.0 X-SA-Exim-Version: 4.2 X-SA-Exim-Scanned: Yes (on mail1.ntp.org) Cc: "Jiangtao \(Gene\) Wen" , erica.yuxing.han@gmail.com, wangjingyuan06@mails.tsinghua.edu.cn, jtwen@mail.tsinghua.edu.cn, bloat@lists.bufferbloat.net, zhangjun06@mails.tsinghua.edu.cn Subject: Re: [Bloat] Taxonomy of various sender-side TCPs 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: Fri, 11 Mar 2011 19:11:01 -0000 On Fri, Mar 11, 2011 at 18:07 UTC, Jonathan Morton wrote: >> http://media.cs.tsinghua.edu.cn/~multimedia/tcp-fit/papers/mobicom10_dem= o.pdf >> http://media.cs.tsinghua.edu.cn/~multimedia/tcp-fit/ > > It would probably help if their DNS worked. =C2=A0:-( > > Actually, the public server at 4.2.2.2 can resolve them, but my home box = can't. =C2=A0An artefact of the Great Firewall perhaps? After digging into this a bit I think there's a connectivity problem to the cs.tsinghua.edu.cn nameservers from some networks and not others. I can't resolve the name when I use my own local recursive nameserver, but I can using any of the google 8.8.8.8, 8.8.4.4 or level3 4.2.2.1, 4.2.2.2, public DNS. With each of those, I can see from TTLs they are able to reach dns1/2.cs.tsinghua.edu.cn when I can't. Turning to http://lg.he.net, I initiated traceroutes from San Jose, Singapore, and Tokyo. The asian routers eventually got through the * * * dead zone to show last hops and destination responding, but the core1.sjc2.he.net traceroute died after two hops while still in the states, similar to what I see via sprintlink in Seattle. The reachability problem for the DNS servers may be related to today's quak= e. Cheers, Dave Hart