Date: Thu, 10 Apr 2008 21:07:41 -0400 From: Mike Andrews <mandrews@bit0.com> To: Chuck Swiger <cswiger@mac.com> Cc: Damian Weber <dweber@htw-saarland.de>, freebsd-stable@freebsd.org Subject: Re: RELENG_6_3 ping and DUP packets Message-ID: <47FEB9DD.3030308@bit0.com> In-Reply-To: <C73D9407-5492-43F4-9BE6-E05C98661107@mac.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>
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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. :)
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