North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: CIDR FAQ
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 ______________________________________________________________________________ Dorian Kim Email: [email protected] 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
|