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Re: IPv6 Prefix announcing
From: "Justin M. Streiner" <streiner () cluebyfour org>
Date: Tue, 26 Apr 2011 12:34:05 -0400 (EDT)

On Tue, 26 Apr 2011, Nick Olsen wrote:

I've always been under the impression its best practice to only announce
prefixes of a /24 and above when it comes to IPv4 and BGP.
I was wondering if something similar had been agreed upon regarding IPv6.
And if That's the case, What's the magic number? /32? /48? /64?

You're likely to get different answers to this, but the 'magic number' appears to be /48. Looking in the v6 BGP table, you will likely find smaller prefixes than that, but a number of the major carriers seem to be settling on /48 as the smallest prefix they will accept. /48 is also the smallest block most of the RIRs will assign to end-users.


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