From owner-freebsd-transport@freebsd.org Fri May 5 07:20:56 2017 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0FB19D5E8F7 for ; Fri, 5 May 2017 07:20:56 +0000 (UTC) (envelope-from gnn@neville-neil.com) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id EA8C9A0E for ; Fri, 5 May 2017 07:20:55 +0000 (UTC) (envelope-from gnn@neville-neil.com) Received: by mailman.ysv.freebsd.org (Postfix) id E9FC3D5E8F6; Fri, 5 May 2017 07:20:55 +0000 (UTC) Delivered-To: transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E9B05D5E8F5 for ; Fri, 5 May 2017 07:20:55 +0000 (UTC) (envelope-from gnn@neville-neil.com) Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [IPv6:2001:4b98:c:538::199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id B48A8A0C for ; Fri, 5 May 2017 07:20:52 +0000 (UTC) (envelope-from gnn@neville-neil.com) Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) by relay9-d.mail.gandi.net (Postfix) with ESMTPS id CD2EF4059B; Fri, 5 May 2017 09:20:49 +0200 (CEST) Received: from mfilter10-d.gandi.net (mfilter10-d.gandi.net [217.70.178.139]) by relay6-d.mail.gandi.net (Postfix) with ESMTP id 4D11AFB8B1; Fri, 5 May 2017 09:20:49 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mfilter10-d.gandi.net Received: from relay6-d.mail.gandi.net ([IPv6:::ffff:217.70.183.198]) by mfilter10-d.gandi.net (mfilter10-d.gandi.net [::ffff:10.0.15.180]) (amavisd-new, port 10024) with ESMTP id lUnbHDJcPGnT; Fri, 5 May 2017 09:20:47 +0200 (CEST) X-Originating-IP: 131.111.5.146 Received: from [192.168.56.1] (global-5-146.nat-2.net.cam.ac.uk [131.111.5.146]) (Authenticated sender: gnn@neville-neil.com) by relay6-d.mail.gandi.net (Postfix) with ESMTPSA id 9EE73FB8D0; Fri, 5 May 2017 09:20:47 +0200 (CEST) From: "George Neville-Neil" To: "Hannes Mehnert" Cc: transport@freebsd.org Subject: Re: dupliceated icmp echo request Date: Fri, 05 May 2017 08:20:46 +0100 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; format=flowed X-Mailer: MailMate (1.9.6r5347) X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2017 07:20:56 -0000 On 13 Sep 2016, at 16:39, Hannes Mehnert wrote: > hello, > > (sorry in case this is the wrong mailing list) > > while doing some network testing, I discovered that my FreeBSD > (r304285, > but likely earlier + released ones as well) sends out two > (bytewise-)identical ICMP echo requests shortly after each other when > I > ping the broadcast (IPv4) address on an interface [tested with: > tap,em,iwm]. > > This behaviour does not meet my expectations - is there any specific > reason for this behaviour; it behaves well (sending out a single ICMP > echo request) if I ping a unicast host. > This got lost in my inbox. Definitely happens on 11, and I think it's a bug. Looking into it now. Please create a PR and assign it to me. Best, George