[154930] in North American Network Operators' Group
Re: using "reserved" IPv6 space
daemon@ATHENA.MIT.EDU (Owen DeLong)
Tue Jul 17 02:42:12 2012
From: Owen DeLong <owen@delong.com>
In-Reply-To: <1342500058.6281.154.camel@karl>
Date: Mon, 16 Jul 2012 23:36:54 -0700
To: Karl Auer <kauer@biplane.com.au>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jul 16, 2012, at 9:40 PM, Karl Auer wrote:
> On Mon, 2012-07-16 at 23:38 -0400, Matt Addison wrote:
>> Oliver <olipro@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa> wrote:
>>> Additionally, as an alternative to RAs, you can simply point default
>>> at the all-routers anycast address.
>>=20
>> Wouldn't this result in duplicate packets leaving your network if
>> there were more than 1 router listening to 'all routers' and you (at
>> the MAC layer) multicasted to those listeners?
>=20
> I think Oliver meant the subnet router anycast address.
>=20
> Anycast gets you to one-of-many. The routers work out which of them is
> currently getting the subnet router anycast traffic. If that router
> drops out for any reason, another of the routers available on the link
> takes over.
>=20
Reread the spec... It gets the packet to one or more of the routers and =
it may well
lead to packet duplication. There may or may not be coordination between =
the
routers. It isn't in the spec.
Owen
