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+The hf6to4 script can be used to setup IPv6 on your home machine and net-
+work for exploring IPv6 without any registrations. 6to4 is a mechanism by
+which your IPv6 address(es) are derived from an assigned IPv4 address,
+and which involves automatic tunnelling to one or more remote 6to4 hubs,
+which will then forward your v6 packets on the 6bone etc. Replies are
+routed back to you over IPv4 via (possibly) other 6to4 capable remote
+gateways. As such, IPv6-in-IPv4-encapsulated packets are accepted from
+all v4-hosts.