Why? I've had dual-stack at home for many years, and I can hit sites via IPv6-only: way back when, I blocked Facebook connectivity for privacy reasons, but at some point I noticed I started getting those little FB icons again that came directly from their servers. Turns out that I was hitting them via IPv6 and had to update my (DNS filtering) rules to block AAAA records as well.
Even my not-very-new Brother HL-L2360 (running firmware from (AFAICT) 2015) supports IPv6, and has both a fe80 link-local address, and a 'proper' address that it got via a prefix advertisement from my Asus router.
Most IoT devices run Linux under the hood and get IPv6 support 'for free'.
Why? I've had dual-stack at home for many years, and I can hit sites via IPv6-only: way back when, I blocked Facebook connectivity for privacy reasons, but at some point I noticed I started getting those little FB icons again that came directly from their servers. Turns out that I was hitting them via IPv6 and had to update my (DNS filtering) rules to block AAAA records as well.
Even my not-very-new Brother HL-L2360 (running firmware from (AFAICT) 2015) supports IPv6, and has both a fe80 link-local address, and a 'proper' address that it got via a prefix advertisement from my Asus router.
Most IoT devices run Linux under the hood and get IPv6 support 'for free'.