IPv6 prefix lengths

William Pitcock nenolod at systeminplace.net
Wed Jan 12 22:39:47 CST 2011


Hi,

On Wed, 12 Jan 2011 22:49:15 -0500
Richard Barnes <richard.barnes at gmail.com> 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?

Traditionally, /48s are per-site.  You should get a /48 for each site,
in reality something like a /44 will do nicely giving you two
additional /48 for growth.

William




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