nanog mailing list archives
Re: IPv6 words
From: Joel Jaeggli <joelja () bogus com>
Date: Fri, 24 Jun 2011 08:16:38 -0700
On Jun 24, 2011, at 6:50 AM, Leo Bicknell wrote:
In a message written on Fri, Jun 24, 2011 at 09:10:53AM +0000, Bjoern A. Zeeb wrote:If you want to do it, make sure you do understand the restrictions that apply to IPv6 addresses, like U/G bits, etc. Too many people unfortunately just think it's cool in a weird geeky sense and violate RFCs with them. I was very close to write an article about that after W6D...Perhaps I missed something in an RFC somewhere, but I believe those bits only have meaning locally on an Ethernet LAN. They have no meaning when used on non-Ethernet networks, for instance POS or on a Loopback. If someone wanted to use them for a /128 virtual for their web site for instance that would be ok. Or, turning that around, if you assume an IPv6 address is part of a /64 on an Ethernet network, you have made a false assumption.
A load-balancer attached to it's first hop router via a /126 may well advertise the virtual ip's it's serving (and treat them) as /128s. the assumption that links are /64s falls down a lot (even on ethernet) when most of them are point-to-point.
-- Leo Bicknell - bicknell () ufp org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/
Current thread:
- IPv6 words Jeroen van Aart (Jun 23)
- Re: IPv6 words Paul Graydon (Jun 23)
- Re: IPv6 words Pete Carah (Jun 23)
- Re: IPv6 words Fred Baker (Jun 23)
- Re: IPv6 words Pete Carah (Jun 23)
- Re: IPv6 words William F. Maton Sotomayor (Jun 23)
- Re: IPv6 words William Herrin (Jun 23)
- Re: IPv6 words Jeroen van Aart (Jun 23)
- Re: IPv6 words Bjoern A. Zeeb (Jun 24)
- Re: IPv6 words Leo Bicknell (Jun 24)
- Re: IPv6 words Joel Jaeggli (Jun 24)
- Re: IPv6 words Leo Bicknell (Jun 24)
- RE: IPv6 words Mike Walter (Jun 24)
- <Possible follow-ups>
- Re: IPv6 words Scott Weeks (Jun 23)
- Re: IPv6 words Ben Carleton (Jun 23)
- Re: IPv6 words ポール・ロラン (Jun 24)
- Re: IPv6 words Ben Carleton (Jun 23)
- Re: IPv6 words Paul Graydon (Jun 23)