Another v6 question

George Bonser gbonser at
Tue Jan 25 13:44:01 CST 2011

> From: Max Pierson
> Sent: Tuesday, January 25, 2011 10:20 AM
> To: nanog group
> Subject: Another v6 question
> >From the provider perspective, what is the prefix-length that most
> accepting to be injected into your tables??  2 or so years ago, I read
> where
> someone stated that they were told by ATT that they weren't planning
> accepting anything smaller than a /32. So what if I get my shiny new
> /48
> from ARIN and am already multi-homed??? Does ATT not want my business
> (which
> they wouldn't get if the first place, but for argument sake, yes, I
> chose to
> pick on ATT, sorry if I offended anyone :)  I already see /40's /48's
> ,etc
> in the v6 table, so some folks are allowing /48 and smaller, so what
> the
> new /24 in v6?

Generally, a /48 from PI space and a /32 from PA space will be accepted.
If you were issued a /48 from ARIN it will generally be accepted.  Some
accept all the way out to a /64.   I do see some de-aggregated /64 nets
I am currently filtering but since the path is the same as the /32, I
haven't seen need to open those filters up yet.  Can't figure out why
those are de-aggregated either as I don't see the more specific
announced anywhere else.

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