issues to the Internet, as a new business paradigm appears and an explosion in the number
of users will continue. IPv6 will support this new Internet, but, in spite of its advantages, it will
be expectable that it will coexist with IPv4 for a long time, due to the huge size of the Internet
today. The migration phase will play a central role in this process and special care has to be
taken concerning inter-operability issues. From the existing set of inter-operability solutions …