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Re: IPv6 Interview Questions and critic
- From: Peter John Hill
- Date: Tue Aug 27 14:45:58 2002
On Tuesday, August 27, 2002, at 10:41 AM, Joe Baptista wrote:
Ipv6 uses 128 bits to provide addressing, routing and identification
information on a computer. The 128-bits are divided into the left-64
and
the right-64. Ipv6 uses the right 64 bits to store an IEEE defined
global
identifier (EUI64). This identifier is composed of company id value
assigned to a manufacturer by the IEEE Registration Authority. The
64-bit
identifier is a concatenation of the 24-bit company_id value and a
40-bit
extension identifier assigned by the organization with that company_id
assignment. The 48-bit MAC address of your network interface card is
also
used to make up the EUI64.
Since it so easy for a host (relative to ipv4) to have multiple ip
addresses, I like what Microsoft has done. If told by a router, a Win
XP box will assign itself a global unicast address using EUI-64. It
will also create a global unicast anonymous address. This will not be
tied to the hardware, and the OS will also limit how long it uses that
address before deprecating that address and creating a new preferred
anonymous address. I can see servers using the EUI-64 address, while
clients use the anonymous address. It will allow servers to narrow down
who is accessing their servers to a 64 bit subnet. That will be good
enough for most statistics, but will make it more difficult to do the
scarier tracking of users.
I have noticed that the Linux and Mac OS X ipv6 implementations so not
create the private addresses automatically.
Peter Hill
Network Engineer
Carnegie Mellon University
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