nanog mailing list archives
Re: Using /126 for IPv6 router links
From: Mark Smith <nanog () 85d5b20a518b8f6864949bd940457dc124746ddc nosense org>
Date: Wed, 27 Jan 2010 15:14:25 +1030
On Tue, 26 Jan 2010 06:38:43 -0800 (PST) David Barak <thegameiam () yahoo com> wrote:
From: Mark Smith nanog () 85d5b20a518b8f6864949bd940457dc124746ddc nosense orgWhy can't IPv6 node addressing be as easy to understand and work with as Ethernet addresses? They were designed in the early 1980s*. 28 years or so years later, it's time for layer 3 addressing to catch up.Becase Ethernet addresses are only locally significant, are not manually assigned in the vast majority of cases,
That makes them globally significant - and that's what makes them 'plug-and-play'. Ethernet addresses are bigger than they operationally need to be, and the 'plug-and-play' nature of them is what we got for that price. That being said, my comment is not specifically about how Ethernet addressing works, it is about how easy Ethernet addressing is to use. It was a rhetorical question. I think it'd be a tragedy if IPv6 addressing is harder to work with than than Ethernet, Appletalk, IPX and a number of other protocols designed at least 10 years or more before it. I really don't understand why people seem so keen on making IPv6 addressing's model look like IPv4's when the primary reason for IPv4's addressing models was the severe lack of address space. btw, did you read the paper I linked too?
and changing a MAC by replacing a NIC has no bearing on the configuration of a { server | router ACL | etc }. Layer 3 addressing is globally significant, and the case we're discussing is addresses which are human-assigned rather than automatically configured. Link-local autoconfiguration in IPv6 works like a champ, and behaves pretty much the way I would want it to. Global addressing approaches, on the other hand, are highly optimized in directions which make them less flexible or have surprising consequences (hence this thread). David Barak Need Geek Rock? Try The Franchise: http://www.listentothefranchise.com
Current thread:
- Re: Using /126 for IPv6 router links, (continued)
- Re: Using /126 for IPv6 router links Igor Gashinsky (Jan 27)
- Re: Using /126 for IPv6 router links Dale W. Carder (Jan 27)
- Re: Using /126 for IPv6 router links David Barak (Jan 28)
- Re: Using /126 for IPv6 router links Igor Gashinsky (Jan 28)
- Re: Using /126 for IPv6 router links Bill Stewart (Jan 29)
- Re: Using /126 for IPv6 router links Leo Bicknell (Jan 25)
- Re: Using /126 for IPv6 router links Owen DeLong (Jan 25)
- Re: Using /126 for IPv6 router links Christopher Morrow (Jan 25)
- Re: Using /126 for IPv6 router links Mark Smith (Jan 26)
- Re: Using /126 for IPv6 router links David Barak (Jan 26)
- Re: Using /126 for IPv6 router links Mark Smith (Jan 26)
- Re: Using /126 for IPv6 router links Grzegorz Janoszka (Jan 26)
- Re: Using /126 for IPv6 router links Owen DeLong (Jan 26)