Is a /48 still the smallest thing you can route independently?

William Herrin bill at herrin.us
Thu Oct 11 21:33:42 UTC 2012


On Thu, Oct 11, 2012 at 5:02 PM, Jo Rhett <jrhett at netconsonance.com> wrote:
> I've finally convinced $DAYJOB to deploy IPv6.  Justification for
> the IP space is easy, however the truth is that a /64 is more
> than we need in all locations. However the last I heard was that
> you can't effectively announce anything smaller than a /48.
> Is this still true?

Hi Jo,

The short answer to your question is:

/48 is the longest prefix from a direct RIR assignment that everyone
currently accepts via BGP.
/32 is the longest prefix from an ISP allocation that everyone
currently accepts via BGP.

As with IPv4 /24's, some folks accept longer prefixes. Not everyone.


> Is this likely to change in the immediate future, or do I need to ask for a /44?

You need to ask for a /44.

Regards,
Bill Herrin


-- 
William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004



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