Multi-Homed Routing

Tom tom at
Mon Sep 1 21:54:17 PDT 2003

On Mon, 1 Sep 2003, Doug Barton wrote:

> On Mon, 1 Sep 2003, Tom wrote:
> > For those in the Americas, ARIN will not give you anything less than a
> > /19
> If this was ever true, it hasn't been true for a long time:

  Strictly speaking it is a /20 now.  It was changed.  But to get a /20,
you need to prove that you are actually using a /20's worth of space of
already.  That means completing filling at least 12 class-Cs.  And by
getting a block from ARIN, you are compelled to re-number, meaning most of
your /20 is gone.  That is ok, if your network isn't growing too quickly,
but if you are adding lots yet, most networks will want a /19.

  You certainly are not going to get a /24 from ARIN:

ARIN allocates IP address prefixes no longer than /20. If allocations
smaller than /20 are needed, ISPs should request address space from their
upstream provider.

> Doug
> --


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