From owner-freebsd-net@FreeBSD.ORG Tue Jul 23 14:22:19 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id A41196BC for ; Tue, 23 Jul 2013 14:22:19 +0000 (UTC) (envelope-from kevin@your.org) Received: from mail.your.org (mail.your.org [IPv6:2001:4978:1:2::cc09:3717]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 5E91C212E for ; Tue, 23 Jul 2013 14:22:19 +0000 (UTC) Received: from mail.your.org (chi02.mail.your.org [204.9.55.23]) by mail.your.org (Postfix) with ESMTP id 875FE84397; Tue, 23 Jul 2013 14:22:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=your.org; h=content-type :mime-version:subject:from:in-reply-to:date:cc:message-id :references:to; s=selector1; bh=U33RfFyVvjzEFKvdUtMtHTSsKtE=; b= mhLgG/XspznFY3vXWWzU8/IrjOT6X5wJpFJRrtG99g3wFljNDoL3ehjvFtUJ4NAa s/khsvhpQZhzIoNXE5PDhtGtrj70JwhIf+n2F0Xi48ojfPRx82bMSDJTuKSnKg4b 3MOC2+iQPuvAgVge/NDfIylC96weZEjMlEI/yfVzaGQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=your.org; h=content-type :mime-version:subject:from:in-reply-to:date:cc:message-id :references:to; q=dns; s=selector1; b=ZmRB65aaktzqDhyKdyje+bb5Uc Xp/tSMcMV/qe3KS1lZ1i9Q9bf44XLxGOM15X3B/O1Ts8UazrAv7UdahsjANgtDYA o2IS1CHlcbS+UNoRA5M2ikgHqO4IVtxvGrPg7unsMvE/xx2EV/OVUIn2dYKDl+8v /3E2DgD8C0Mx6fnoM= Received: from vpn132.rw1.your.org (vpn132.rw1.your.org [204.9.51.132]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mail.your.org (Postfix) with ESMTPSA id 3054284396; Tue, 23 Jul 2013 14:22:17 +0000 (UTC) Content-Type: multipart/signed; boundary="Apple-Mail=_8415871D-F9FE-4784-94D1-C94BC2AC3DBD"; protocol="application/pkcs7-signature"; micalg=sha1 Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Subject: Re: Duplicate Address Detection misfire? From: Kevin Day In-Reply-To: Date: Tue, 23 Jul 2013 09:22:16 -0500 Message-Id: <3341F665-B179-4A99-B48A-81EE3D0478A6@your.org> References: <06BA4BD5-BE4E-4184-AFBB-D7FD4B2597D9@your.org> To: Zaphod Beeblebrox X-Mailer: Apple Mail (2.1508) Cc: FreeBSD Net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Jul 2013 14:22:19 -0000 --Apple-Mail=_8415871D-F9FE-4784-94D1-C94BC2AC3DBD Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Sorry for the slow reply. We run mainly ESXi (the bare metal version of VMware, not the desktop = versions) but I do remember seeing something sort of similar on a = desktop version ages ago. Basically we narrowed it down to a Windows = driver bug on the host system's ethernet card. It was basically = reflecting back everything it transmitted into the receive queue. This = was before IPv6 was in use here, but I remember it breaking a file = sharing protocol (SMB? AFP?) that also didn't like seeing its own = multicasts/broadcasts echoed back to itself. By any chance is this on a system using WiFi rather than wired ethernet? = Many routers/access points/wifi adapters have problems with the idea of = VMware's "bridged mode" networking - they expect only one MAC per = station and do not do the right thing in some places. I don't have an answer for you, but I'd look at the physical networking = card/adapter on the host OS first if I were troubleshooting this. = Updated driver/replace with something else/etc. -- Kevin On Jul 23, 2013, at 12:44 AM, Zaphod Beeblebrox = wrote: > What to do when you don't trust the interface? VMWare is obviously = emulating the hardware and their interpretation of what the hardware = "is" is possibly different from ours. >=20 > If I boot single-user and tcpdump the interface, I see two transmitted = solicitations. The kernel claims to have sent one. >=20 > My concern: is the vmware interface reflecting the solicitation packet = because it is a broadcast packet? >=20 > To determine this, I've gone over the tcpdump and pcap-filter man = pages to look for a way to only dump packets leaving from or arriving at = an interface. Can this be done? >=20 > If VMWare is reflecting the packet back, I'm curious as to how we can = fix this. >=20 --Apple-Mail=_8415871D-F9FE-4784-94D1-C94BC2AC3DBD Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIPITCCBN0w ggPFoAMCAQICEHGS++YZX6xNEoV0cTSiGKcwDQYJKoZIhvcNAQEFBQAwezELMAkGA1UEBhMCR0Ix GzAZBgNVBAgMEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBwwHU2FsZm9yZDEaMBgGA1UECgwR Q29tb2RvIENBIExpbWl0ZWQxITAfBgNVBAMMGEFBQSBDZXJ0aWZpY2F0ZSBTZXJ2aWNlczAeFw0w NDAxMDEwMDAwMDBaFw0yODEyMzEyMzU5NTlaMIGuMQswCQYDVQQGEwJVUzELMAkGA1UECBMCVVQx FzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5ldHdvcmsx ITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTE2MDQGA1UEAxMtVVROLVVTRVJGaXJz dC1DbGllbnQgQXV0aGVudGljYXRpb24gYW5kIEVtYWlsMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A MIIBCgKCAQEAsjmFpPJ9q0E7YkY3rs3BYHW8OWX5ShpHornMSMxqmNVNNRm5pELlzkniii8efNIx 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