Date: Fri, 11 Apr 2008 11:51:15 +0200 (CEST) From: Damian Weber <dweber@htw-saarland.de> To: freebsd-stable@freebsd.org Cc: Jeremy Chadwick <koitsu@freebsd.org> Subject: Re: RELENG_6_3 ping and DUP packets Message-ID: <Pine.BSO.4.64.0804110934440.20160@isl-s-02.htw-saarland.de> In-Reply-To: <20080411065256.GA95213@eos.sc1.parodius.com> References: <396418019.20080409104542@serebryakov.spb.ru> <5f67a8c40804100944k3984ab8fp95b5d4b22f92dd30@mail.gmail.com> <Pine.BSO.4.64.0804102140550.30252@isl-s-02.htw-saarland.de> <C73D9407-5492-43F4-9BE6-E05C98661107@mac.com> <Pine.BSO.4.64.0804110842280.21736@isl-s-02.htw-saarland.de> <20080411065256.GA95213@eos.sc1.parodius.com>
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On Thu, 10 Apr 2008, Jeremy Chadwick wrote: > Date: Thu, 10 Apr 2008 23:52:56 -0700 > From: Jeremy Chadwick <koitsu@freebsd.org> > To: Damian Weber <dweber@htw-saarland.de> > Cc: freebsd-stable@freebsd.org > Subject: Re: RELENG_6_3 ping and DUP packets > > On Fri, Apr 11, 2008 at 08:48:10AM +0200, Damian Weber wrote: > > > From: Chuck Swiger <cswiger@mac.com> > > > To: Damian Weber <dweber@htw-saarland.de> > > > 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. Bingo! No duplicates anymore. Is this considered as a permanent solution or just a "hack"? In any case, I've summarized it on http://www-crypto.htw-saarland.de/weber/misc/unix/freebsd-dup-packets/ including the output of the mptable command (MSI disabled/enabled). Thanks a lot, Damian
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