3 ms·Unitymedia, a huge German ISP, has been running dual stack for a few years now.by _yy 11y agoUnitymedia, a huge German ISP, has been running dual stack for a few years now.Malstrond 11y agoActually it's Dual Stack Lite, so you win an IPv6 address, but lose your publicly routable IPv4 address and port forwarding._yy 11y agoWhich is really annoying, too, since there's no configurable IPv6 firewall (it's either on or off). But at least they do use IPv6.