NIST IPv6 document

Tue Jan 11 17:10:47 UTC 2011

On 1/11/2011 10:57 AM, Valdis.Kletnieks at vt.edu wrote:
> The same exact way you currently track down an IP address that some machine has
> started using without bothering to ask your DHCP server for an allocation, of course.
>

But it's no easier. Especially when you hit the customer equipment. NAT 
may be gone there, but knowing which computer it is will likely be 
impossible (as it won't be standard policy for the customer to grab arp 
tables).

> Remember - the privacy extension was so that somebody far away on the Internet
> couldn't easily correlate "all these hits on websites were from the same box".
> It gives a user approximately *zero* protection against their own ISP dumping
> the ARP tables off every switch 5 minutes and keeping the data handy in case
> they have to track a specific MAC or IP address down.
>

I dislike this method, though. It works, but I much prefer to correlate 
with radius accounting logs backended on a DHCP server. Sadly, even in 
v4, implementations are not always available. Of course, I don't run NAT 
at the provider edge, but customer's often do, and while I will be able 
to track the customer, knowing which machine will be just as impossible 
as it is with NAT.

Jack