Dorian Rysling Kim
dorian at CIC.Net
Fri Aug 18 05:38:39 UTC 1995
On Fri, 18 Aug 1995, Hank Nussbacher wrote:
> >Ah. here is the rub. When you ISP buddies come back, you should ask
> >them to return the origianal /22 for a /20. That way, the total size
> >of the routing system stays the same!
> Great idea. Know ANYONE who does that? The best I can do is give them a
> /20 (in addition to the original /22) if their growth warrants it.
Sure. We are starting to do that. We are trying to put into practice
following allocation strategy:
1) when allocating, leave enough holes so the address space can be grown
within that /16. For example, leaving next three spaces unallocated when
assigning /24. We try to guess at who'll be growing and how much. It's
not perfect, but it's better than nothing.
2) if the site returns /24, or /23, or /22, and we can't grow that
address block, we try to see if we can recycle the old block and assign a
new larger block.
This way, if our internal routing changes, and our old aggregation scheme
breaks, we keep renumbering to the minimum.
Dorian Kim Email: dorian at cic.net 2901 Hubbard Drive
Network Engineer Phone: (313)998-6976 Ann Arbor MI 48105
CICNet Network Systems Fax: (313)998-6105 http://www.cic.net/~dorian
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