[137083] in North American Network Operators' Group
Re: IPv6 addressing for core network
daemon@ATHENA.MIT.EDU (sthaug@nethelp.no)
Wed Feb 9 08:46:42 2011
Date: Wed, 09 Feb 2011 14:45:52 +0100 (CET)
To: sam@spacething.org
From: sthaug@nethelp.no
In-Reply-To: <93AA0E79-76BF-439C-BD37-05AEAA401BC9@spacething.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> > A /127 mask is still the best way to handle real point-to-point links
> > like SDH/SONET today, to avoid the ping-pong problem. Works fine with
> > Cisco and Juniper, not tried with other vendors.
> >
>
> Can you elaborate on this? What's the ping-pong problem?
This has been well covered in the past. See
http://tools.ietf.org/html/draft-ietf-ipngwg-p2p-pingpong-00
http://tools.ietf.org/html/draft-kohno-ipv6-prefixlen-p2p-01
http://archive.apnic.net/meetings/26/program/apops/matsuzaki-ipv6-p2p.pdf
It's a problem for real point-to-point links like SDH/SONET which
don't use Neighbor Discovery.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
