From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Tue Dec 20 2005 - 17:45:48 GMT-3
According to the Cisco Press book "Implementing Cisco IPv6 Networks", RIR's
allocate /32 prefixes to ISP's. ISP's allocate /48 prefixes to each customer
site. Each customer site uses /64 prefixes for each subnet.
Isn't that a little excessive?
Why does every subnet need a /64?!? Isn't that 1.8 quintillion addresses per
subnet?!? What a waste!
On the other hand If the average ISP has a /32 and he is allocating /48 that
means he only has 2^16 or 65536 prefixes to allocate. Doesn't seem that much
at all.
I know IPv6 is supposed to provide plenty of addresses, but aren't these
large allocations reminiscent of the 1980's when IPv4 registries were
handing out Class A and Class B subnets to every Tom, Dick and Harry that
asked for one?
What I'm saying is that even though the IPv6 address space can accommodate
3.4*10^38 addresses, if the registries keep handing out such large chunks of
address most of the addresses will be wasted.
I'm just concerned that in the future there won't be any addresses left to
assign to my wireless electric toothbrush!
Any thoughts?
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