[141578] in North American Network Operators' Group
Re: Cogent IPv6
daemon@ATHENA.MIT.EDU (sthaug@nethelp.no)
Thu Jun 9 08:26:32 2011
Date: Thu, 09 Jun 2011 14:26:23 +0200 (CEST)
To: cra@WPI.EDU
From: sthaug@nethelp.no
In-Reply-To: <20110609120147.GV25373@angus.ind.WPI.EDU>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> > Of course, just because you allocate a /112 (or shorter) in your
> > database doesn't mean you have to use it. You could also allocate a
> > /112 for a point-to-point link and use a /127 (e.g. addresses ::a and
> > ::b).
>
> Please don't use /127:
>
> Use of /127 Prefix Length Between Routers Considered Harmful
> http://tools.ietf.org/html/rfc3627
Please *do* consider using /127 on "real" point-to-point links (e.g.
SDH/SONET, serial) - especially if you have internet facing links and
are using a hardware based forwarding platform from vendors like Cisco
or Juniper.
This may be your simplest choice if you want to avoid the "ping-pong"
problem which is very real (on some platforms). See
http://tools.ietf.org/html/rfc6164
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
