Most of the above applies with no major differences to either IPv4 or IPv6 networks. What are specific to IPv6 are the so-called transition mechanisms. In fact they are meant to provide internetworking between IPv4 and IPv6 resources. These mechanisms can be seen as services offered to the users. They need the administrator to pay attention to them depending on how they are implemented, managed and the secured. For instance, designing a 6to4 service requires decisions on which users should be allowed to use the service, where the 6to4 gateways are installed, whether there are any 6to4 relays available in the network or if another network’s relays are allowed, At the present time, it is not yet completely clear how to manage such services and what information is relevant for the administrator. Since most of these mechanisms are based upon encapsulation techniques, the security issues are those associated with these kinds of well known mechanisms in IPv4. More information is available in 6NET deliverable D6.2.2v2 [D6.2.2] on operational procedures for secured management with transition mechanisms.