[134953] in North American Network Operators' Group
Re: IPv6 prefix lengths
daemon@ATHENA.MIT.EDU (Michiel Klaver)
Thu Jan 13 05:09:19 2011
Date: Thu, 13 Jan 2011 11:09:13 +0100
From: Michiel Klaver <michiel@klaver.it>
To: Richard Barnes <richard.barnes@gmail.com>
In-Reply-To: <AANLkTimPTPk7TFw2=CucUrVe0VTAGETckXVZvhy13XDo@mail.gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
At 22-07-28164 20:59, Richard Barnes wrote:
> Hi all,
>
> What IPv6 prefix lengths are people accepting in BGP from
> peers/customers? My employer just got a /48 allocation from ARIN, and
> we're trying to figure out how to support multiple end sites out of
> this (probably around 10). I was thinking about assigning a /56 per
> site, but looking at the BGP table stats on potaroo.net [1], it looks
> like this is not too common (only .29% of prefixes). Thoughts?
>
> Thanks,
>
Hi Richard,
Most major transit providers with IPv6 support filter at a maximum prefix
length of /48 [1]
Also, some guidance in subnetting can be found at several places on the web [2]
[1]
http://en.wikipedia.org/wiki/Comparison_of_IPv6_support_by_major_transit_providers
[2] http://en.wikipedia.org/wiki/IPv6_subnetting_reference
