6to4, SixXS, 6RD, and 6in4 are tunnels that are usable by pretty much anyone anywhere right now, as opposed to native IPv6. It helps if your router supports the

6to4, SixXS, 6RD, and 6in4 are tunnels that are usable by pretty much anyone anywhere right now, as opposed to native IPv6. It helps if your router supports them, of course. Cloud storage is really nice when your home PC is switched off, or a hard drive crashes, or your computer catches on fire. Other than those sorts of problems, BitTorrent Sync can already do pretty much everything you want over IPv4.