[137074] in North American Network Operators' Group
Re: IPv6 addressing for core network
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Wed Feb 9 05:00:54 2011
From: Iljitsch van Beijnum <iljitsch@muada.com>
In-Reply-To: <20110209.104804.74661138.sthaug@nethelp.no>
Date: Wed, 9 Feb 2011 10:59:24 +0100
To: sthaug@nethelp.no
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 9 feb 2011, at 10:48, sthaug@nethelp.no wrote:
>> The all zeros address is the all routers anycast address so on most =
non-Cisco routers you can't use it, ruling out /127. The top 128 =
addresses in any subnet are also reserved anycast addresses although =
they don't do much in practice. So the longest prefix length you should =
use is /120 and only use addresses 1 - 127.
> 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.
I know it's immature, but I can't wait for some new hire at vendor C or =
vendor J to reread the RFCs and implement the all routers anycast =
address according to spect and then see sparks fly.
Like I said, global scope addresses on your router-to-router interfaces =
is such IPv4 thinking.=
