[Scott_Sanderson]

Both of my ISPs offer IPv6 gateways. I set them up and visited several IP6 websites.

I crypto exchange I use frequently, Bittrex, allows to whitelist an IP address. Since I have a static IPv4, I did so. Problem is, my request to bittrex always goes out the IP6 gateway and Bittrex does not recognize me. I had to shut down the IP6 gateway to get into the account.

[scrollaway]

You have a static ip4 but not a static ip6? Or does bittrex not allow whitelisting an ip6?

[usr1106]

Static IPv6 are rare by default because computers for end users should use IPv6 privacy extensions. In Ubuntu 16.04 LTS timeframe privacy extension was still broken a bit, so it did not work on every network adapter. Nowadays it just works, unless a crazy network gives you only /128.

I have no idea about Windows and MacOS.

[Symbiote]

The whole address changes, but there's usually a prefix that doesn't change, e.g. /64.

Whitelisting the /64 is then equivalent to whitelisting a single IPv4 address with a NATted network behind it, although since ISPs may use different IPv6 prefix lengths it might not be easy for users to know what they should use.

("ip ad" etc show the current address with prefix.)

[hansel_der]

> unless a crazy network gives you only /128

like the incumbant cable network in germany (vodafone) ...

[usr1106]

What? Germany is one of the most privacy-aware countries. So people should make some noise. Of course internet is still a bit new for all of us as the still-chancellor noted to too long ago... So technical incompetence does not surprise me. Vodafone prefers to make headlines with criminal sales practices.

[CyberShadow]

You can configure your operating system to prefer IPv4 over IPv6. On glibc systems, this can be done by adding e.g. "precedence ::ffff:0:0/96 100" to /etc/gai.conf.