nanog mailing list archives
Re: Cogent IPv6
From: Jack Bates <jbates () brightok net>
Date: Thu, 09 Jun 2011 10:43:00 -0500
On 6/9/2011 10:02 AM, William Herrin wrote:
I follow the reasoning, but unless you attach undue importance to the colons you get basically the same result with a /124. I guess choosing /112 for a point to point link is one of the weird side-effects of placing :'s in the address at fixed locations instead of arbitrary locations that serve the writer's mnemonic convenience.
For the most part, you are correct. I generally run a :town:router:linkid:linkaddresses format out of a single /64 per regional area. While I could shorten the number of linkaddresses more, I'm not sure of the need.
Even if I assigned it as a /124, I'd still allocate it as a /112 and just set the first 2 nibblets as 0. My reluctance to do so has more to do with uniformity, especially when providing support. It's much easier to rattle off the standard length than to have to look it up. There are cases where a /124 wouldn't be enough.
Honestly, it's all a matter of preference. There are technical issues against using /127 and there's pros and cons to using longer than /64. There are interoperability issues as well as ping pong handling issues. It was just my opinion that 16 bits was more than enough for each branch of allocation that I wanted.
Jack
Current thread:
- Re: Cogent IPv6, (continued)
- Re: Cogent IPv6 Mark Radabaugh (Jun 08)
- Re: Cogent IPv6 Martin Millnert (Jun 08)
- Re: Cogent IPv6 ryan (Jun 08)
- Re: Cogent IPv6 Owen DeLong (Jun 08)
- RE: Cogent IPv6 Kelly Setzer (Jun 08)
- Re: Cogent IPv6 William Herrin (Jun 08)
- Re: Cogent IPv6 Chris Adams (Jun 08)
- Re: Cogent IPv6 Aftab Siddiqui (Jun 08)
- Re: Cogent IPv6 Jack Bates (Jun 09)
- Re: Cogent IPv6 William Herrin (Jun 09)
- Re: Cogent IPv6 Jack Bates (Jun 09)
- Re: Cogent IPv6 Joel Jaeggli (Jun 09)
- RE: Cogent IPv6 George Bonser (Jun 09)
- Re: Cogent IPv6 Chuck Anderson (Jun 09)
- Re: Cogent IPv6 Rob Evans (Jun 09)
- Re: Cogent IPv6 Grzegorz Janoszka (Jun 09)
- Re: Cogent IPv6 sthaug (Jun 09)
- Re: Cogent IPv6 Owen DeLong (Jun 09)
- Re: Cogent IPv6 Chuck Anderson (Jun 09)
- Re: Cogent IPv6 sthaug (Jun 09)
- Re: Cogent IPv6 Iljitsch van Beijnum (Jun 09)