nanog mailing list archives
Re: Using /126 for IPv6 router links
From: Leo Bicknell <bicknell () ufp org>
Date: Sat, 23 Jan 2010 20:28:21 -0800
In a message written on Sat, Jan 23, 2010 at 01:52:21PM +0100, Mathias Seiler wrote:
I use a /126 if possible but have also configured one /64 just for the link between two routers. This works great but when I think that I'm wasting 2^64 - 2 addresses here it feels plain wrong. So what do you think? Good? Bad? Ugly? /127 ? ;)
I have used /126's, /127's, and others, based on peers preference. I personally have a fondness for /112's, as it gives you more than 2 addresses, and a DNS bit boundary. For all the pontification about how there are enough /64's to number all the grains of sand, or other nonsense, I think that ignores too much operational information. rDNS is important, and becomes harder in IPv6. Making it easier is importnat. Having a scan of a /64 fill your P2P T1 is poor design, all because you assigned 2^64 addresses to a link that will never have more than 2 functional devices. Most importantly, we should not let any vendor code any of these into software or silicon, in case we need to change later. -- Leo Bicknell - bicknell () ufp org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/
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Current thread:
- Re: Using /126 for IPv6 router links, (continued)
- Re: Using /126 for IPv6 router links Larry Sheldon (Jan 25)
- Re: Using /126 for IPv6 router links Owen DeLong (Jan 25)
- Re: Using /126 for IPv6 router links Joe Maimon (Jan 26)
- Re: Using /126 for IPv6 router links Daniel Senie (Jan 26)
- Re: Using /126 for IPv6 router links Joe Maimon (Jan 26)
- Re: Using /126 for IPv6 router links Aaron C. de Bruyn (Jan 26)
- Re: Using /126 for IPv6 router links Joel Jaeggli (Jan 29)
- Re: Using /126 for IPv6 router links Owen DeLong (Jan 26)
- Re: Using /126 for IPv6 router links Mark Smith (Jan 24)
- Re: Using /126 for IPv6 router links Nathan Ward (Jan 24)
- Re: Using /126 for IPv6 router links Owen DeLong (Jan 24)
- Re: Using /126 for IPv6 router links Richard A Steenbergen (Jan 25)
- Re: Using /126 for IPv6 router links Mathias Seiler (Jan 25)
- RE: Using /126 for IPv6 router links Matt Addison (Jan 25)
- RE: Using /126 for IPv6 router links Igor Gashinsky (Jan 26)
- Re: Using /126 for IPv6 router links Steve Bertrand (Jan 26)
- Re: Using /126 for IPv6 router links Grzegorz Janoszka (Jan 27)
- RE: Using /126 for IPv6 router links TJ (Jan 27)