It's Friday. Time to plug IPv6 some more. :-) http://b.logme.in/2012/11/07/changes-to-hamachi-on-november-19th/ LogMeIn Hamachi is basically a NAT-traversing layer 2 VPN solution. They avoided conflicts with RFC 1918 space by hijacking IPv4 space in 5/8, now actively being allocated by LIRs in Europe. When that didn't work (see link above), they moved to 25/8, allocated to the UK MoD. While I'm almost sure that they haven't got it quite so wrong this time, following the comments says that the idea was not only a very bad one to start with, it's cost a lot of people a lot of grief that IPv6 was clearly going to mitigate in renumbering. Perhaps it is why they recommend it per default, if not for the number of applications that would be broken by it. By the way, is this an application that the new shared transition space might benefit? Cheers, Sabahattin