Every packet leaving an IPv6 network that isn't NATed has an effective node ID in the packet. No need to guess just look at the packets.
Behind a NAT, observers can only make that connection (using only addresses) for the network as a whole, instead of an individual device on the network. So the privacy extensions are weaker than NAT
(If the IPv6 privacy extensions used a different address for each connection, they would be more like NAT in this regard.)
That said, other observable clues still allow connections from a single device to be associated, NAT or not. There's TCP OS fingerprinting for example, and the close timing of related connections.
In this scenario it's a lot more work trying to map out your infrastructure than to try performing a MITM connection against some of your outbound traffic.
With any usable N, a clever observer would still easily work out what you were doing and still map out your infrastructure.
The ISPs have the ability to see what is on your network by IPv4 egress. They have been able to do this for a decade.
Worrying that an IPv6 address divulges the network forgets that IPv4 devices betray their existence through DNS, their destinations and other network behavior.
The ISPs know.
Many of these routers are managed by the ISP using protocols such as TR-069, several ISPs have already been found to not only manage the devices but also monitor certain data including what devices are present.
2. You can't say anything about the percentage with just the absolute market value. At the very least you need something else to compare it too.
Please, be serious.
So, I mean, I dunno, 2 billion dollars seems serious to me, but maybe we just have different barometers for what counts as "serious amounts of money". Especially considering these devices that are like $300.
Finally, might I remind you of the guidelines? in particular:
> When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."
There is a whole industry built around network traffic analysis.
What makes you think it doesn't happen on the internet?
More reasonable is to use new address for each connection. Then nobody can tell if 10 addresses and 10 connections are one device or ten.
You've saved the translation in the router, but now routing lookups and ARP caches have grown by TEMP_VALID_LIFETIME / TEMP_PREFERRED_LIFETIME.
What are valid values in the scenario you are proposing? The defaults are 1 week / 1 day, so 7X. If you chose to rotate each second, and say allowed addresses to only be valid for say 20 minutes, this still appears to be a ~1200X blowup in routing overheads.
They have not?
The global routing table size for ipv6 at max is a /32 (if i remember correctly) every customer gets a /56 prefix to use in their network, so the routing table entry would still be the same, no matter how many addresses you use to cycle through in your /64.
ARP caches do not exist in IPv6, and Neighbour discovery does not have the same "cache" mechanism as ARP does, it uses an entirely different mechanism for neighbour discovery. (which is also far more lightweight considering it is using multicast, compared to the broadcast of ARP).