Add TODO notes

TODO

@@ -12,3 +12,16 @@
   the --private option
 
 - Put a section about how to build the package from the sources in the README
+
+- Babel limitations:
+
+  - The metric does not take latency into account.
+  - re6stnet needs to communicate with Babel so that only unused tunnels are
+    freed. For the moment, routes will be randomly broken throughout the
+    network, from time to time, for small amounts of time.
+  - Babel must be able to set source address on routes it installed. Otherwise,
+    a wrong IP will be selected if managed interfaces already have several
+    public IPv6. If there's only one interface like this, a workaround is to
+    use --main-interface option on it.
+
+- Is it useful that each node regenerates its own DH parameter ?

re6st/tunnel.py

@@ -163,6 +163,8 @@ class TunnelManager(object):
                     count -= self._makeTunnel(peer, address)
                 else:
                     ip = utils.ipFromBin(self._network + peer)
+                    # TODO: Send at least 1 address. This helps the registry
+                    #       node filling its cache when building a new network.
                     try:
                         self.sock.sendto('\2', (ip, PORT))
                     except socket.error, e: