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Re: IPv6 Interview Questions and critic

  • From: Peter John Hill
  • Date: Tue Aug 27 17:40:22 2002

On Tuesday, August 27, 2002, at 05:07  PM, Marshall Eubanks wrote:

On Tue, 27 Aug 2002 14:43:38 -0400
 Peter John Hill <> wrote:

On Tuesday, August 27, 2002, at 10:41  AM, Joe Baptista wrote:

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
Wasn't this described in an Internet draft ? Do you know what the status is -
I cannot seem to find it.

   Nodes use IPv6 stateless address autoconfiguration to generate
   addresses without the necessity of a Dynamic Host Configuration
   Protocol (DHCP) server.  Addresses are formed by combining network
   prefixes with an interface identifier.  On interfaces that contain
   embedded IEEE Identifiers, the interface identifier is typically
   derived from it.  On other interface types, the interface identifier
   is generated through other means, for example, via random number
   generation.  This document describes an extension to IPv6 stateless
   address autoconfiguration for interfaces whose interface identifier
   is derived from an IEEE identifier.  Use of the extension causes
   nodes to generate global-scope addresses from interface identifiers
   that change over time, even in cases where the interface contains an
   embedded IEEE identifier.  Changing the interface identifier (and the
   global-scope addresses generated from it) over time makes it more
   difficult for eavesdroppers and other information collectors to
   identify when different addresses used in different transactions
   actually correspond to the same node.


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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