teredo traffic on 6to4 relay ?

[Mark Pace Balzan]

> 6to4 tunnels are just proto-41 tunnels, with one difference, they should only handle packets where a source address on the tunnel side is 6to4 (thus 2002::/16). Clearly 
> you are accepting proto-41 traffic with any kind of source address, otherwise this could not be happening.

Indeed, but the point im raising here is not about the correct use of RPF or other security/filtering mechanisms, but to see if anyone has seen this type of behaviour before to understand out of interest what is happening.