I'm just saying it's one valid security issue with using any sort of globally unique IP address (v4 or v6), in that analyzing a bunch of traffic from a particular netblock would allow one to build a topology map. It's easier with IPv6 since you can presume most if not all addresses are on /64s out of a /48 (so look to the fourth quad for the "subnet ID").
I understand and totally agree.
Obviously if someone is super concerned with revealing this sort of info there are other things besides NAT they can do, such as using a proxy server(s) for various internet applications, transparent proxies, etc. But it is a valid security concern for some.
Could not agree more which is why I stated that there are other ways of accomplishing the "hiding internal topology" using other methodoligies. NAT/PAT has caused me many headaches which is why I am so opposed to using it.
Also, is that your real name? ;-)
No, but this list is great for buying and selling clue. In today's market, clue is equivalent to gold. :)