IPv6 Prefix announcing

Owen DeLong owen at delong.com
Tue Apr 26 19:32:11 UTC 2011

I know that used to be true, but, to the best of my knowledge, everyone is now accepting
down to /48s in provider independent ranges. Some still require /32 or shorter in the provider aggregate ranges.


Sent from my iPad

On Apr 26, 2011, at 10:39 AM, Kate Gerry <kate at quadranet.com> wrote:

> Funny enough, some carriers actually require the 'smallest' as being /32... :(
> -----Original Message-----
> From: Justin M. Streiner [mailto:streiner at cluebyfour.org] 
> Sent: Tuesday, April 26, 2011 9:34 AM
> To: nanog at nanog.org
> Subject: Re: IPv6 Prefix announcing
> 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.
> jms

More information about the NANOG mailing list