Date: Mon, 25 Sep 2023 20:02:42 +0200 From: "Patrick M. Hausen" <pmh@hausen.com> To: Mark Millard <marklmi@yahoo.com> Cc: Ronald Klop <ronald@FreeBSD.org>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Getting a stable MAC address for a RPI CM3+ with ue0 interface Message-ID: <0783DA55-E91C-43DB-8D0F-C3F0FCF7FC4A@hausen.com> In-Reply-To: <C1F83FCE-C39E-45E2-8C2C-7CE74B98FD5E@yahoo.com> References: <3C1032FF-B914-4863-8A03-759A8B4BE216@hausen.com> <77E70D30-8E7D-42DC-A041-3A783E1C6908@yahoo.com> <5205C76E-BAB4-4AB7-8A03-1E8A2D4353BB@hausen.com> <B50A4409-84C0-405D-8099-43692243AE52@hausen.com> <84C20AD4-1F37-414E-8808-60A2C9B621D9@karels.net> <4951c134-39be-43de-0aa7-430a136d8b36@FreeBSD.org> <2071C2B6-B61A-40E0-8DA2-1E23D463B2E9@hausen.com> <8305B36C-9DFE-4FF1-A836-80F2931A6A46@hausen.com> <C1F83FCE-C39E-45E2-8C2C-7CE74B98FD5E@yahoo.com>
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Hi, > Am 25.09.2023 um 19:54 schrieb Mark Millard <marklmi@yahoo.com>: >=20 > Definately not, in multiple ways. >=20 > 0) Having multiple Ethernet adapters plugged in can all be used > over the same time frame. The MAC addresses need to be distinct. >=20 > 1) RPi4B's and the like are not set up to have such MAC addresses. > Only older RPi*'s are. You are correct. Yet CM3+ is what I am using. This is as far as I understood an official RPi Foundation document on the topic: = https://pip.raspberrypi.com/categories/685-whitepapers-app-notes/documents= /RP-003474-WP/Changing-MAC-addresses.pdf > How are MAC addresses generated? >=20 > The MAC address is the set of six hexadecimal numbers of the form = aa:bb:cc:dd:ee:ff. > On devices prior to the Raspberry Pi 4x the MAC address is generated = from the Raspberry Pi serial number. For example, if your Raspberry Pi = serial number is 58d2ec5c, the MAC address will be generated from the = bottom six nibbles, combined with the Raspberry Pi Foundation = Organizationally Unique Identifier (OUI), which is b8:27:eb, so the = final MAC address would be b8:27:eb:d2:ec:5c. > This address is generated on startup by the firmware, and passed on to = the Linux kernel for use by the Ethernet driver. And this is what I am referring to. My company runs a a handfull of RPi3, I have this TuringPi with seven = CM3+ which I ran under various versions of Ubuntu or Raspbian/Raspberry Pi OS - and = when run under Linux they all do this. Kind regards, Patrick=
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