Comments on: Are we running out of MAC addresses? https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/ technology, networking, virtualization and IP telephony Sun, 23 Mar 2014 20:44:56 +0000 hourly 1 https://wordpress.org/?v=6.8.3 By: Michael McNamara https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-22596 Sun, 23 Mar 2014 20:44:56 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-22596 In reply to Kim A..

The IEEE maintains and MAC OUI tables and registration process.

http://standards.ieee.org/develop/regauth/manid/index.html

Cheers!

]]> By: Kim A. https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-22587 Fri, 21 Mar 2014 12:02:20 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-22587 Who keeps track of all the Mac-adresses? Can I be certain that the mac-address on the 10 base T card I have had lying on the shelf the last 15 years never have been duplicated?

]]> By: Tony Bourke https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-15211 Wed, 03 Apr 2013 03:13:54 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-15211 The least two significant bits of the first octet of the OUI determine if the MAC address is either unicast/multicast, and if the MAC address is locally unique or globally unique. That means there’s about 4 million OUIs, instead of 16. That’s still a lot, but the presentation said they’re shooting for 100 year life span. Dang.

]]> By: Dominik https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-14753 Tue, 19 Mar 2013 21:26:29 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-14753 The problem is not that we are running out of MAC adresses, the vendor segemantation is more problematic. If you take a look in the oui you can find some unbelivable obsolate reservations.
IMHO Ethernet has its limitions, but it still serves us good enghough.
Is anybody working on a new Layer 2 protocol atm ?

]]> By: Mike D https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-14746 Tue, 19 Mar 2013 15:10:10 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-14746 Ferro,
wait.. Ethernet limitations and problems? I thought we adopted Ethernet because Token Ring, FDDI, ATM all had too many problems while Ethernet had none? Well it doesn’t matter anyway because with SDN to get us to the cloud all our problems will be solved….forever.

]]> By: Greg Ferro https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-14610 Fri, 15 Mar 2013 19:28:11 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-14610 I’ve been wondering how much longer we will keep Ethernet with all of its limitations and problems ?

It COULD be replaced since it’s only local to the link. In the past we had Token Ring and FDDI in addition to Ethernet which sort of proves we could replace it.

Maybe we could simply move to a new protocol at Layer 2 ?

]]> By: Telair https://blog.michaelfmcnamara.com/2013/03/are-we-running-out-of-mac-addresses/comment-page-1/#comment-14601 Fri, 15 Mar 2013 16:09:30 +0000 http://blog.michaelfmcnamara.com/?p=3566#comment-14601 While not an immediately pressing issue, you have to think the existing MAC address system was only created to support the needs of network adapter cards in PC’s connected to LAN’s. My laptop I have has a MAC for it’s wired network port, it’s wireless network port, it’s Bluetooth card and Firewire port and I have a smartphone with a MAC for it’s wireless and another one for it’s Bluetooth adapter plus one for my Bluetooth headset. So the MAC address system is being used now for much. much more than it was originally designed for. A good sit-down and rethink how we are going to do this isn’t such a bad idea.

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