DragonFlyBSD

Years ago, i found urpf-failed doesn't work with IPv6; significant packet loss if configured.

Many PF tutorials suggest a rule like:

block in quick from { $broken urpf-failed no-route } to any

But it turned out urpf-failed can only be configured for IPv4, like:

block in log quick inet from urpf-failed to any

See: https://lists.dragonflybsd.org/pipermail/users/2017-August/313577.html