[address-policy-wg] FWD: [GLOBAL-V6] draft-narten-iana-rir-ipv6-considerations-00.txt
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bmanning at vacation.karoshi.com
bmanning at vacation.karoshi.com
Thu Jul 14 16:41:58 CEST 2005
On Thu, Jul 14, 2005 at 02:47:26PM +0100, Niall Murphy wrote: > Thomas, all, > > > I'd welcome discussion/feedback on it, and this list seems as good a > > place as any. > > > > http://www.ietf.org/internet-drafts/draft-narten-iana-rir-ipv6-considerations-00.txt > > This is nit-picking, but for the sake of clarity: > > 2.7. Utilization > > In IPv4, the utilization of a chunk of address space is defined as > the ratio of the actual number of host assignments to the theoretical > maximum number of host assignments. For example, a /24 in IPv4 can > number 256 hosts [...] > > A /24 can't number 256 hosts; it can number 254. an IPv4 /24 is 192.0.2.0-192.0.2.255 or 256 discreate numbers. subtract the all-ones and all-zeros.. 256-2 = 254... BUT ... wrap the /24 into a /22 and you -CAN- use the (apparent) zero & one nubmers are host assignments. the trick is in the mask and the placement of the "/24" in the overall announcement... you can't have an all-ones or all-zeros for the host. > > Niall --bill
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