Initial revision

TODO

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+* write better documentation
+
+* Adapt it to IPv6 - better yet, any protocol.
+  * this would require to base routing on MAC addresses instead of IP
+    addresses, as is done now. If this can be done, IPX is also
+    supported.
+  * let tinc assign a MAC address to the tap device, based on some
+    whacky number
+
+* add a digital signature to each packet, using HMAC
+
+* enable encryption using other ciphers (IDEA)
+  * the library is already included, but it cannot be used.
+
+* allow multiple outgoing links, or a list of them, so that if a host
+  is not available, that we can select another from the list.
+
+* support for multiple protocols; PPTP, IPSec, NIAS, L2TP,...