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/