Hi, We are using 6to4 on our fallback site because the provider there is not able to provide us native IPv6 yet. We have also installed a fallback nameserver over there using a 6to4 address. This works good and no complains what so ever in the past. However, last week Denic (registry for .de) changed their policy (or their checks). They don't allow a nameserver for a .de domain anymore which contains a 6to4 address. The policy is "it should be a global unicast AND the block should be assigned to a RIR for suballocation purpose". The 6to4 range is Global Unicast (http://www.iana.org/assignments/ipv6-unicast-address-assignments/) but it is not assigned to a RIR because it is a special block. This fails their policy and their checks (resulting in a ERROR: 105 All IPv6 Addresses must be Global Unicast). Ok, policy is policy and we should not complain. However, I'm asking your opinions about this policy. I find this really stupid because this completely brakes use for 6to4 in Germany and their is no good reason to block it. We know we should push our provider to support native IPv6, and we do. But this should not stop us using IPv6 6to4. regards, Igor Ybema