Some ISPs (such as mine) are really taking their time getting IPv6 rolled out, so for the last 10 years I've been using Hurricane Electric's Tunnel Broker service to get IPv6 connectivity. I just installed an eero system, and was disappointed to find that 6in4 was not supported (like it was in my last 10 years worth of routers). Is support coming? I'll have to use bridge mode until then.