3 ms·

In general, no. All operating systems default to using random host bits in SLAAC addresses, each bootup (or change of network interface) will instantiate a new

by chungy 3y ago

In general, no. All operating systems default to using random host bits in SLAAC addresses, each bootup (or change of network interface) will instantiate a new address. More than that though, IP addresses in both v4 and v6 varieties are unreliable sources for tracking and basically no actor you'd want to guard against depends on them anyway. With mobile phones being common, your public addresses are changing all the time anyway. On IPv4, CGNAT is becoming increasingly more common so that you might share a public IPv4 address with thousands of other people at the same time.

comex 3y ago
> On IPv4, CGNAT is becoming increasingly more common so that you might share a public IPv4 address with thousands of other people at the same time. Which is an advantage from an anti-tracking perspective — an advantage you won’t get with IPv6, no?
- orangeboats 3y ago
  A counterpoint is that by cycling through IPv6 addresses no one can ever tell who is who by addresses alone. Okay, they could probably tell from the IPv6 prefix because the entire company/household shares it, but people used to ("use to" if you live in a Western country, probably) share the same public IPv4 address too so I find that point rather moot. Another very strong counterpoint to this is that, you can't really build a truly-P2P network nor self-host a service on Internet, when everyone is behind CGNAT. At some point, as IPv4 resources get scarcer, only corporates will have the ability to host services on the Internet, and I don't think it is in their interests to host Tor nodes, for example...
- bdd8f1df777b 3y ago
  You get a new IPv6 address very quickly (mostly every day or every week). That makes tracking difficult too. While the prefix is mostly stable, that is akin to the public CGNAT address.
  - wmf 3y ago
    It's not really, since an IPv6 /64 prefix has one customer behind it while a CGNAT has N customers.
    - kemotep 3y ago
      I mean people are just going to log into their gmail account in their chrome browser and it doesn’t matter if you change IP’s every single minute, that identity isn’t changing as often and the relevant information Google wants will be tracked.
  - deleted 3y ago
    [deleted]
- lmm 3y ago
  > Which is an advantage from an anti-tracking perspective Depends. It makes it harder for someone outside your ISP to track you, but it makes it easier for your ISP to track you, and harder for them to justify not keeping logs of where you've connected to (since that data is necessary for their CGNAT system to work).
nerdbert 3y ago
SLACC dynamic address are basically the same as IPv4 NAT from this perspective. Everyone who cares has tables of the prefix size assigned to customers in various providers' IP space.
nottorp 3y ago
> All operating systems default to using random host bits in SLAAC addresses, each bootup (or change of network interface) will instantiate a new address. Great, so I can't connect my laptop to my desktop across reboots without setting up some internal dns?
- rany_ 3y ago
  No, IPv6 devices are typically assigned both a permanent IPv6 address and a temporary one. When using the internet, it uses the temporary address for privacy reasons.
  - nottorp 3y ago
    "Typically". Would you care to list all the acronyms one needs to learn about to get to 'typically' if you need to hand configure your network?
    - chungy 3y ago
      If you want to hand configure your network, set up DHCP and disable SLACC. I wouldn't recommend it, because it just makes life harder, but you can do it. Even better though, hostname resolution works just fine on link local addresses (fe80::/16), you needn't care about public addresses to communicate on a LAN. Or hell, you're on a LAN, keep configuring IPv4 they way you always have.
- orangeboats 3y ago
  On Windows, you will see a "temporary IPv6 address" and "IPv6 address" on your network configuration screen. On Linux, you will see an IPv6 address without a temporary tag, and an IPv6 address with one, when you run the command `ip address`: inet6 2406:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:62c9/64 scope global temporary dynamic inet6 2406:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:a31c/64 scope global dynamic mngtmpaddr noprefixroute Temporary IPv6 address changes every now and then, but your stable IPv6 address will never change unless your ISP changes your prefix, you change your network, or your network card entirely. When you are browsing the internet, the OS will use the temporary address for outgoing connections (unless the application forces stable addressing). But when you are hosting a service, you give your users (in this case, your laptop) the stable address.

by chungy 3y ago

comex 3y ago

> On IPv4, CGNAT is becoming increasingly more common so that you might share a public IPv4 address with thousands of other people at the same time. Which is an advantage from an anti-tracking perspective — an advantage you won’t get with IPv6, no?

orangeboats 3y ago
A counterpoint is that by cycling through IPv6 addresses no one can ever tell who is who by addresses alone. Okay, they could probably tell from the IPv6 prefix because the entire company/household shares it, but people used to ("use to" if you live in a Western country, probably) share the same public IPv4 address too so I find that point rather moot. Another very strong counterpoint to this is that, you can't really build a truly-P2P network nor self-host a service on Internet, when everyone is behind CGNAT. At some point, as IPv4 resources get scarcer, only corporates will have the ability to host services on the Internet, and I don't think it is in their interests to host Tor nodes, for example...
bdd8f1df777b 3y ago
You get a new IPv6 address very quickly (mostly every day or every week). That makes tracking difficult too. While the prefix is mostly stable, that is akin to the public CGNAT address.
- wmf 3y ago
  It's not really, since an IPv6 /64 prefix has one customer behind it while a CGNAT has N customers.
  - kemotep 3y ago
    I mean people are just going to log into their gmail account in their chrome browser and it doesn’t matter if you change IP’s every single minute, that identity isn’t changing as often and the relevant information Google wants will be tracked.
- deleted 3y ago
  [deleted]
lmm 3y ago
> Which is an advantage from an anti-tracking perspective Depends. It makes it harder for someone outside your ISP to track you, but it makes it easier for your ISP to track you, and harder for them to justify not keeping logs of where you've connected to (since that data is necessary for their CGNAT system to work).

nerdbert 3y ago

SLACC dynamic address are basically the same as IPv4 NAT from this perspective. Everyone who cares has tables of the prefix size assigned to customers in various providers' IP space.

nottorp 3y ago

> All operating systems default to using random host bits in SLAAC addresses, each bootup (or change of network interface) will instantiate a new address. Great, so I can't connect my laptop to my desktop across reboots without setting up some internal dns?

rany_ 3y ago
No, IPv6 devices are typically assigned both a permanent IPv6 address and a temporary one. When using the internet, it uses the temporary address for privacy reasons.
- nottorp 3y ago
  "Typically". Would you care to list all the acronyms one needs to learn about to get to 'typically' if you need to hand configure your network?
  - chungy 3y ago
    If you want to hand configure your network, set up DHCP and disable SLACC. I wouldn't recommend it, because it just makes life harder, but you can do it. Even better though, hostname resolution works just fine on link local addresses (fe80::/16), you needn't care about public addresses to communicate on a LAN. Or hell, you're on a LAN, keep configuring IPv4 they way you always have.
orangeboats 3y ago
On Windows, you will see a "temporary IPv6 address" and "IPv6 address" on your network configuration screen. On Linux, you will see an IPv6 address without a temporary tag, and an IPv6 address with one, when you run the command `ip address`: inet6 2406:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:62c9/64 scope global temporary dynamic inet6 2406:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:a31c/64 scope global dynamic mngtmpaddr noprefixroute Temporary IPv6 address changes every now and then, but your stable IPv6 address will never change unless your ISP changes your prefix, you change your network, or your network card entirely. When you are browsing the internet, the OS will use the temporary address for outgoing connections (unless the application forces stable addressing). But when you are hosting a service, you give your users (in this case, your laptop) the stable address.