Usage of fd00::/8 on the Interwebz - something with filters and uRPF

[Jeroen Massar]

...
 4  2001:7f8:1::a500:3303:1 (2001:7f8:1::a500:3303:1)  20.755 ms  20.763 ms  20.784 ms
 5  fd00:3303::1 (fd00:3303::1)  22.010 ms  21.984 ms  21.986 ms
 6  2a02:120c:1051:d010::1 (2a02:120c:1051:d010::1)  17.806 ms  17.889 ms  17.842 ms
 7  2a02:120c:1051:d010::1 (2a02:120c:1051:d010::1)  18.720 ms  18.593 ms  18.617 ms
...

Hmmmm fd00::/8, that really should never ever be visible on the Internet, being Unique *LOCAL* Addresses.
And it does not look like they applied the randomness bit for picking a prefix either.
You would also almost think that a /28 is more than enough address space to put a few router loopbacks in.

It is apparently time for people to start checking their filters again because it seems that these packets leak into other ASNs too...

More generally, do recheck your network for BCP38 compliance, please do apply it and require your peers to do the same!

Greets,
 Jeroen