Date: Mon, 04 Nov 2013 06:25:59 -0800 From: Peter Grehan <grehan@freebsd.org> To: Aryeh Friedman <aryeh.friedman@gmail.com> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: how is the MAC for tap(4) computed? Message-ID: <5277AE77.8050804@freebsd.org> In-Reply-To: <CAGBxaXn27u3J6iJBoDkW_R2=_kcHzSBU=d0v5eDUvnoAsucSjw@mail.gmail.com> References: <CAGBxaXn27u3J6iJBoDkW_R2=_kcHzSBU=d0v5eDUvnoAsucSjw@mail.gmail.com>
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Hi Aryeh, > There seems to be a very high rate of MAC address collisions when tap is > running on different machines.... is there anyway to make the selection of > MAC more random Do you mean, tap(4) when used with bhyve ? If so, bhyve calculates the MAC address for adapters based on an md5 hash of the PCI slot/function and VM name. If you use the same bhyve configuration on a different machine, the MAC address will be the same. If that's the problem, you may want to supply your own MAC address with the "mac=" parameter on the command line e.g. later, Peter.
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