Re: Will a single /27 get fully routed these days?

[Owen DeLong <owen () delong com>]

On Jan 25, 2014, at 13:59 , Sander Steffann <sander () steffann nl> wrote:

> Hi,
>
> > Yeah, its been a while since I had to get involved in this.  We have a
> > customer with their own IPv4 allocation that wants us to announce a /27 for
> > them. Back in "the day", it was /24 or larger or all bets were off.  Is
> > that still the case now?
>
> This is still the case today.
>
> I wonder what will change (if anything) when ARIN runs out of IPv4 space. Geoff's current predictions say Feb 2015, 
> but I wouldn't be surprised if it turns out to be sooner than that. But, when that happens ARIN will only have the 
> 'Dedicated IPv4 block to facilitate IPv6 Deployment' [1] left, and it will use 'a minimum size allocation of /28 and 
> a maximum size allocation of /24' for that block. The block is meant for things like dual stacked DNS servers, NAT64 
> and other IPv6 deployments where a bit of IPv4 is still necessary.
>
> I wonder how reachable those systems will be... Will people adjust their filters, or will most usage of this block 
> (and thereby all new entrants in the ISP market in the ARIN region) just be doomed?

That's actually may not be the best question. That block will come from within a specific prefix and I suspect that 
ISPs and the like will adjust their filters FOR THAT PREFIX.

Consider the possibility of a policy change which allows the transfer of smaller blocks (current ARIN policy limits 
this to /24 minimum, but ARIN policy is not immutable, we have a policy development process so that anyone who wants to 
can start the process of changing it.)

Owen