s is not quite true. These operators are often the larger operators with global presence. The major operators providing Internet transit to other operators, including the Tier 1 operators, have provided IPv6 service both to their operator and business customers. In that sense, one can claim that the Internet core network has been IPv6 capable already for some time. This development has happened incrementally over many years, and has been mostly invisible to the end user. The operators have also had good transition tools, which have made it relatively easy to support IPv6 in the Internet core. Though, some progressive access network operators have deployed IPv6 and provided it to the end users, most of the world's access operators do not provide IPv6, yet. There are many reasons for the slowness of IPv6 deployment in the Internet access networks. First of all, IPv6 is a not a feature that operators can sell to the end users. This absence of an evident business case has most probably been the number one reason for the slow adoption of IPv6 in access networks. This is not a feature that the users would currently demand, or for which they would be prepared to pay. Other important contributors are the relatively slow investing cycle - especially in the fixed access networks - and the result of the presence of very old equipment in the networks. Even though new equip- ment does support IPv6 well, access operators may have equipment that is as much as ten years old in their network, which would have to be replaced. Investment without a prospect of more revenue is never popular in the management of a company. In addition, as mentioned earlier, the lack of IPv6 capable home routers may have influenced the Introduction deployment plans. On the other hand, it is hard to say what is the cause and what is the symptom. Looking on the bright side, the number of IPv6 capable access networks is steadily growing, including big fixed access operators like Comcast providing commercial service already. One reason stated for the slow 