Ipv6: making it trivially easy for Facebook and Google to track individual devices!
(I certainly understand the problems with ipv4, but ipv6 reveals far too much information in it's current state).
(I certainly understand the problems with ipv4, but ipv6 reveals far too much information in it's current state).
Let's say I'm a transit provider [like Google]. Right now, I see TLS traffic from your public IPv4 address to another public IPv4 address. I have no idea how many devices are behind those public IP addresses. I can maybe combine a few assumptions with my browser-based tracking, but it's difficult to identify you in apps I don't have control over.
Switch to IPv6, now I know exactly how many devices behind your firewall are talking and how many devices you're talking to.
Even better, I can combine this with a browser-based tracker and I can see what you're doing in apps I don't control. I first identify you with the browser and what IPv6 address you're using. Then as you use other apps that I can't spy on, I just have to look for your IPv6 address in my transit traffic to figure out what you're doing.
Or... just stop using google and use uBlock Origin to block all Google domains.
What information does IPv6 reveal?
Ipv4 did not have this. Many users were allocated IPs temporarily from IP pool
So it was difficult to track inviduals devices as IP would change all time.