From owner-freebsd-stable@FreeBSD.ORG Fri Apr 11 06:52:56 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 DDF26106564A for ; Fri, 11 Apr 2008 06:52:56 +0000 (UTC) (envelope-from jdc@parodius.com) Received: from mx01.sc1.parodius.com (mx01.sc1.parodius.com [72.20.106.3]) by mx1.freebsd.org (Postfix) with ESMTP id D0F0B8FC12 for ; Fri, 11 Apr 2008 06:52:56 +0000 (UTC) (envelope-from jdc@parodius.com) Received: by mx01.sc1.parodius.com (Postfix, from userid 1000) id C08201CC033; Thu, 10 Apr 2008 23:52:56 -0700 (PDT) Date: Thu, 10 Apr 2008 23:52:56 -0700 From: Jeremy Chadwick To: Damian Weber Message-ID: <20080411065256.GA95213@eos.sc1.parodius.com> References: <396418019.20080409104542@serebryakov.spb.ru> <5f67a8c40804100944k3984ab8fp95b5d4b22f92dd30@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Cc: 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 06:52:57 -0000 On Fri, Apr 11, 2008 at 08:48:10AM +0200, Damian Weber wrote: > > From: Chuck Swiger > > To: Damian Weber > > Cc: freebsd-stable@freebsd.org > > Subject: Re: RELENG_6_3 ping and DUP packets > > > > 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.... > > good point, but it's the same > > A.B.C.X# tcpdump -e icmp > tcpdump: listening on rl0, link-type EN10MB > 08:41:51.136023 0:20:ed:5f:3:3b 0:19:99:33:7c:9 ip 98: A.B.C.X > A.B.C.D: icmp: echo request > 08:41:51.136171 0:19:99:33:7c:9 0:20:ed:5f:3:3b ip 98: A.B.C.D: icmp: echo reply > 08:41:51.136343 0:19:99:33:7c:9 0:20:ed:5f:3:3b ip 98: A.B.C.D: icmp: echo reply > 08:41:52.138366 0:20:ed:5f:3:3b 0:19:99:33:7c:9 ip 98: A.B.C.X > A.B.C.D: icmp: echo request > 08:41:52.138447 0:19:99:33:7c:9 0:20:ed:5f:3:3b ip 98: A.B.C.D: icmp: echo reply > 08:41:52.138692 0:19:99:33:7c:9 0:20:ed:5f:3:3b ip 98: A.B.C.D: icmp: echo reply > ^C > 169 packets received by filter > 0 packets dropped by kernel Possibly an interrupt is being called twice on the same packet? Shot in the dark, but try disabling MSI/MSI-X and see if the problem recurs. Put this in /boot/loader.conf: hw.pci.enable_msi="0" hw.pci.enable_msix="0" Reboot, and see if the problem continues. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |