Teredo only used as last resort after IPv4

[Brandon Butterworth]

>>> Does anybody have a contact at the BBC who can disable that open
>>> recursive DNS server (212.58.224.21)?
> 
> I've no idea why that is open (again, I thought I closed in once,
> way back). I will have those currently responsible fix this

I've traced this in the audit trail to recursion being enabled
in Dec 2004 but the villain didn't log why. It was set to not from
at least 1998 (harder to trace records prior to then).  Trust
no one, especially your own ops.

regards
brandon