[150975] in North American Network Operators' Group
Re: Questions about anycasting setup
daemon@ATHENA.MIT.EDU (Mehmet Akcin)
Fri Mar 9 03:24:55 2012
From: Mehmet Akcin <mehmet@akcin.net>
In-Reply-To: <20120309081131.GC17726@h.detebe.org>
Date: Fri, 9 Mar 2012 00:23:55 -0800
To: Elmar K. Bins <elmi@4ever.de>
Cc: NANOG Mailing List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Mar 9, 2012, at 12:11 AM, Elmar K. Bins wrote:
>>> 3. IPv6! - Is /32 is standard? We have only one /32
>>> allocation from ARIN and thus if using /32 seems like hard deal - =
we have
>>> to likely get another /32 just for anycasting? or we can use /48 =
without
>>> issues? Also, is /48 a good number for breaking /32 so that we can =
do /48
>>> announcements from different datacenters in simple uni casting =
setup?
>>=20
>> A /48 is quite reasonable. Announcing a whole /32 just for your =
anycast service would be wasteful.
>=20
> Why? It's simply another prefix, no matter how big. It might look
> wasteful, but if *that* is the allocation you *have*, it's the
> one you ought to use.
>=20
> One should be careful - people do filter on allocation lengths, so
> breaking out a /48 out of a /32 allocation and advertising it on its
> own can lead to it being filtered.
if you know anyone who is filtering /48 , you can start telling them to =
STOP doing so as a good citizen of internet6.
I agree with Woody anything more than /48 for anycast is waste.
mehmet=
