16 vs 32 bit ASNs [Re: BBC does IPv6 ;) (Was: large multi-site enterprises and PI]

Mon Nov 29 18:04:51 UTC 2004

On Mon, 2004-11-29 at 09:58 -0800, Owen DeLong wrote:
> 
> --On Monday, November 29, 2004 5:41 PM +0100 Jeroen Massar 
> <jeroen at unfix.org> wrote:
> 
> > On Mon, 2004-11-29 at 08:35 -0800, Owen DeLong wrote:
> >> > Also, with 32bit ASN's, also expect upto 2^32 routes in your routing
> >> > table when each and every ASN would at least send 1 route and of course
> >> > there will be ASN's sending multiple routes.
> >> >
> >> Only if EVERY ASN were allocated and active.
> >
> > *BUZZZ* ASN's are a globally unique resource, you not seeing it does not
> > mean that it is not in use. For that matter anything from a prefix to a
> > ASN that any of the RIR's hands out does not have to show up on the
> > public internet, it could even be used by a single company internally,
> > just like RFC1918 prefixes, or on a VPN etc.
> >
> > <SNIP>
> >
> Duh... You're making my point for me.  There won't be 2^32 routes from 1 
> route per ASN unless ALL 2^32 ASNs are assigned.

You should indeed stop the drool&duh part as that is exactly not what I
wrote ;)

> Further, lots of ASNs get used for things that don't put routes in the 
> global table.  (If I can't see it, it's not in the global table).
> 
> > Which damage might that be? The prefixes are not supposed to be put in
> > the global routing table and even if people did, with 16bit ASN you only
> > allow 65536 routes, which is less than current IPv4... oops let's
> > disable repeat mode... also see my nice comment on 6to4, that is more
> > useful if you want a globally unique /48 for sure, that is if you really
> > 'own' the IPv4 space of that prefix.
> >
> But, that "should" becomes a purely artificial barrier which will be
> eliminated by market economics. Finally, with the limitations of
> 16 bit ASNs (which we will surpass regardless of reclamation), we won't
> likely end up with 1 prefix per ASN.  The prefixes will be out there
> regardless of the number of ASNs that end up originating them.

Which "should" might that be, you most likely cut it.

> > For that matter Ford and some other /8's are only 2002:13::/24, which is
> > the same size as the 6bone space that was handed out early on. Do also
> > realize that if this all becomes a peep-up and the RIR's (or actually
> > IANA) runs out of space that they can try all over 7 more times, *that*
> > is how much IPv6 space is available.
> >
> And?

Stop the duh and read again ;)

Greets,
 Jeroen

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