Nov 06 03:33 2013, Stas Degteff wrote to Markus Reschke:
MR>> The node might running dual stack inside the LAN but only got IPv4 MR>> Internet access.
SD> FYI, any node with ipv4 MAY connect to IPv6 world using "6to4" tunnel SD> or teredo or tunnel brocker. IPv6 on my node connected via 6to4 SD> (address in the subnet 2002::)
Emphasis on "may" ;-) How much nodes are able to manage IPv6 transition mechanisms? And we shouldn't rely too much on Teredo since it's future is quite uncertain.