The other common mistake is blocking ICMPv6 completely. This creates a really broken IPv6 stack! edit: I've been running dual-stack with Windows, macOS, iOS &

The other common mistake is blocking ICMPv6 completely. This creates a really broken IPv6 stack! edit: I've been running dual-stack with Windows, macOS, iOS & Linux for at least a decade now - I think it's closer to 20 years than 10! I've never seen it be like the parent post for my personal use, but I have seen it broken like that in places I've worked with incorrectly configured routers/firewalls. edit 2: this isn't a good idea for v4 either, but it's less broken than v6!