Salut,
On Sun, Jan 28, 2007 at 12:26:11PM +0100, Almir Karic wrote:
> they said the SAME thing about ipv4.... :/
The big problems of IPv4 aren't address space problems but performance
problems. There are two big issues:
1. deaggregation. A lot of small nets clog up the pipe which don't have
to be announced separately when distributed appropriately. Solution:
give every customer as many IPs that he'll never have to come back for
more.
2. Routing header parsing. IPv4 uses variable length headers, which involves
more overhead than IPv6, who puts extensions into the extension header,
so the routing header parsing involves no special logic.
> >65536 x the total number of possible 48-bit MAC addresses.
>
> irrelevant.
Not exactly. By default, IPv6 gives you 65535 subnets with
18446744073709551615 possible IPs each. There aren't many companies on this
planet who operate more than 65'000 sites (as in factories, buildings,
whatever).
You don't believe me? Write a small script which pings every IPv4 address on
the Internet. The result is: there aren't all that many of them occupied,
and there are even entirely vacant class A networks. However, the majority
of them are heavily fragmented, which is the real problem.
Tonnerre
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