IPv6 Prefix announcing

Patrick W. Gilmore patrick at ianai.net
Tue Apr 26 16:44:24 UTC 2011

On Apr 26, 2011, at 12:39 PM, Kate Gerry wrote:

> Funny enough, some carriers actually require the 'smallest' as being /32... :(

Vote with your wallet.

Some carriers would prefer if only transit free networks were allowed to originate routes.  Doesn't mean you should follow their lead.


> -----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

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