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Interesting about the Android devices. I only have one in the house and it only gets powered on every few weeks, so this wasn't that. I've turned off IPv6 on my LAN for the time being but I'll have to turn it back on and see if I can find any commonalities between the devices producing that issue.

@meelokun did you ever get to the bottom of this? I am having the exact same issue. Dual stack IPv4+6, seeing lots of the same "cannot forward src..." errors. They're all link-local IPv6 addresses coming in on my OPNsense box's LAN interface and trying to go out the WAN interface. I can use the NDP lookup table to determine which devices are doing this, but it doesn't tell me why they're doing it.

I'm positive this is due to an IPv6 misconfiguration...somewhere. But not sure where to look next.