Color me skeptical. It’s true that many SMB network infrastructure devices have poor support for IPv6, particularly w.r.t. the management interface. But IPv6

Color me skeptical. It’s true that many SMB network infrastructure devices have poor support for IPv6, particularly w.r.t. the management interface. But IPv6 support is old at this point. Very few things have no (as opposed to inconvenient) IPv6 support. For heavens sake, there are versions of IRIX and VMS/VAX with IPv6 support. Those OSes run exclusively on hardware that hasn’t been manufactured for two decades, and the companies that released them have been defunct for almost as long. Windows XP (deprecated over 10 years ago) supports it. MacOS 10.7 (released 10 years ago) supports it. In other words, if you’re willing to run network management from a dual-stack host, you can probably switch over all “regular hosts” today at zero hardware cost. You have to be running seriously old hardware and software to not have IPv6 support today. So old that it should be on an air-gapped network anyway. The only relatively common exception is Cisco Meraki and some cheap consumer-level AIO router/APs.