From owner-freebsd-stable@FreeBSD.ORG Fri Apr 11 01:23:20 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0EBF3106564A for ; Fri, 11 Apr 2008 01:23:20 +0000 (UTC) (envelope-from mandrews@bit0.com) Received: from magnum.bit0.com (magnum.bit0.com [207.246.88.226]) by mx1.freebsd.org (Postfix) with ESMTP id DE2D98FC0C for ; Fri, 11 Apr 2008 01:23:19 +0000 (UTC) (envelope-from mandrews@bit0.com) Received: from [172.27.0.11] (nat.bit0.com [207.246.88.210]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by magnum.bit0.com (Postfix) with ESMTPSA id DC0F45641E; Thu, 10 Apr 2008 21:07:39 -0400 (EDT) Message-ID: <47FEB9DD.3030308@bit0.com> Date: Thu, 10 Apr 2008 21:07:41 -0400 From: Mike Andrews User-Agent: Thunderbird 2.0.0.12 (Windows/20080213) MIME-Version: 1.0 To: Chuck Swiger References: <396418019.20080409104542@serebryakov.spb.ru> <5f67a8c40804100944k3984ab8fp95b5d4b22f92dd30@mail.gmail.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Damian Weber , freebsd-stable@freebsd.org Subject: Re: RELENG_6_3 ping and DUP packets X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Apr 2008 01:23:20 -0000 Chuck Swiger wrote: > On Apr 10, 2008, at 1:58 PM, Damian Weber wrote: >> But here is the problem, pinging the machine from remote gives >> >> A.B.C.X$ ping A.B.C.D >> PING A.B.C.D (A.B.C.D): 56 data bytes >> 64 bytes from A.B.C.D: icmp_seq=0 ttl=64 time=0.272 ms >> 64 bytes from A.B.C.D: icmp_seq=0 ttl=255 time=0.391 ms (DUP!) > > Please run "tcpdump -e icmp" on this box and repeat your testing. It > will be most interesting to know whether you're seeing the same MAC > address.... I'm seeing the same thing on *one* of my RELENG_7 boxes, including the problem going away at 1481 bytes. In my case, if I run "tcpdump -e icmp" on both the offending RELENG_7 box and on the machine pinging it (tried with both a Mac Mini running Leopard on the same LAN, and a RELENG_7_0 box on the other side of a DSL line), the RELENG_7 box only shows a single reply packet going out, but the pinger shows two -- and both packets have the same (correct) mac address. It does not happen with all of my RELENG_7 machines though... just one of them... even though all of them have the same motherboard chipset (Intel 3000) and NIC (em0). I haven't figured out exactly when it started or what's different about that one machine. It doesn't seem to hurt anything other than it's somewhat annoying and Nagios complains bitterly about it. :)