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Re: IPv6 Interview Questions and critic

  • From: Marshall Eubanks
  • Date: Tue Aug 27 17:09:32 2002

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:
> > 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

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

> 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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