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Picking a MAC address for a FreedomBoxPicking a MAC address for a FreedomBoxPosted Dec 6, 2012 6:16 UTC (Thu) by smoogen (subscriber, #97)Parent article: Picking a MAC address for a FreedomBox
18:03:73:be:76:4a
This MAC address identifies the relevant system as having been manufactured by Dell. If Dell has done its job properly (and there is no evidence to the contrary), no other Ethernet interface on the planet should have that same MAC address.
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Is that meant to be true anymore? I know it used to be, but I have seen a lot of collisions from various vendors. Usually we were told that they only tried to keep the probability down to no MAC collisions in say a Class A network, but that they couldn't guarantee more than that.
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I remember trying that on a couple of networks and that caused all kinds of issues with routers that used 00:00:00.. as a sort of 0.0.0.0 in broadcasts and such.
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Picking a MAC address for a FreedomBox Posted Dec 6, 2012 6:35 UTC (Thu) by jreiser (subscriber, #11027) [Link] I have seen a lot of collisions from various vendors. Data, please. I have seen duplicates, too, but they were twenty years ago in the early 1990s, and they were from deliberate reproduction by cloners who were producing counterfeit boxes.
Picking a MAC address for a FreedomBox Posted Dec 7, 2012 15:58 UTC (Fri) by shane (subscriber, #3335) [Link]
I have an Android phone I ordered from China that arrived a couple weeks ago which has a MAC address not present in the IEEE database, so it is likely that it can collide with some properly-registered device at some point in the future.
I checked here:
http://standards.ieee.org/develop/regauth/oui/oui.txt
The MAC address starts with d2:a1:42, which is not present.
Picking a MAC address for a FreedomBox Posted Dec 7, 2012 16:48 UTC (Fri) by TomH (subscriber, #56149) [Link]
That address has the "locally administered" bit set so at least they've done that right and aren't trampling on any address that will ever be assigned to somebody else.
Picking a MAC address for a FreedomBox Posted Dec 6, 2012 12:36 UTC (Thu) by lkundrak (subscriber, #43452) [Link] Well, there surely are vendors that use addresses that they should not. According to [1], following ones are using locally administered address (& 0x020000). Also, note the "not registered" ones. 020406 BBN internal usage (not registered) 020701 Interlan [now Racal-InterLAN] DEC (UNIBUS or QBUS), Apollo, Cisco 020701 Racal-Datacom 026060 3Com 026086 Satelcom MegaPac (UK) 02608C 3Com IBM PC; Imagen; Valid; Cisco; Macintosh 02A0C9 Intel 02AA3C Olivetti 02CF1F CMC Masscomp; Silicon Graphics; Prime EXL 02E03B Prominet Corporation Gigabit Ethernet Switch 02E6D3 BTI (Bus-Tech, Inc.) IBM Mainframes 2E2E2E LAA (Locally Administered Address) for Meditech Systems 475443 GTC (Not registered!) (This number is a multicast!) 525400 Realtek (UpTech? also reported) 52544C Novell 2000 5254AB REALTEK (a Realtek 8029 based PCI Card) 565857 Aculab plc audio bridges AA0000 DEC obsolete AA0001 DEC obsolete AA0002 DEC obsolete AA0003 DEC Global physical address for some DEC machines AA0004 DEC Local logical address for DECNET systems E20C0F Kingston Technologies [1] http://www.cavebear.com/archive/cavebear/Ethernet/vendor.html
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