Date: Tue, 23 Jul 2013 09:22:16 -0500 From: Kevin Day <kevin@your.org> To: Zaphod Beeblebrox <zbeeble@gmail.com> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: Duplicate Address Detection misfire? Message-ID: <3341F665-B179-4A99-B48A-81EE3D0478A6@your.org> In-Reply-To: <CACpH0MdzB7hurx0Dk7Z09bMrXRmR8X%2BregphVgS0L7nGS%2B22XQ@mail.gmail.com> References: <CACpH0McSM7HDeJcQ1pLcXuEZ96n=15YmCaP4YheZghBbyEgfUw@mail.gmail.com> <06BA4BD5-BE4E-4184-AFBB-D7FD4B2597D9@your.org> <CACpH0MdBk6aQhO6CugaiKTTv0GOS6dNeegwnxFSsd4n0mUOSmA@mail.gmail.com> <CACpH0MeemqKt4MEDw4PjycgA4PE4ejihJu9_G=Y9C2kZLdzXPA@mail.gmail.com> <CACpH0MdzB7hurx0Dk7Z09bMrXRmR8X%2BregphVgS0L7nGS%2B22XQ@mail.gmail.com>
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--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 <zbeeble@gmail.com> = 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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