[121665] in North American Network Operators' Group
Re: Using /126 for IPv6 router links
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Sat Jan 23 23:28:54 2010
Date: Sat, 23 Jan 2010 20:28:21 -0800
From: Leo Bicknell <bicknell@ufp.org>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <0C4E3B08-C930-411A-8E8E-53B528C039E8@mironet.ch>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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In a message written on Sat, Jan 23, 2010 at 01:52:21PM +0100, Mathias Seil=
er wrote:
> I use a /126 if possible but have also configured one /64 just for the li=
nk between two routers. This works great but when I think that I'm wasting =
2^64 - 2 addresses here it feels plain wrong.
>=20
> 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.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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