On 2008-11-19 09:37, Antonio Querubin wrote: ... > > How about auto-enabling 6to4 assuming it can actually reach a > 192.88.99l.1 gateway? That doesn't guarantee connectivity; you actually need to see an IPv6 reply before you know that 6to4 is working. So you really need to enable 6to4, run a reachability test, and disable it if no response. Brian