nick suggests that the hello cell should have both server IP and

         Version                 [1 byte]

         Timestamp               [4 bytes]

         Number of addresses     [1 byte]

         Addresses               [variable]

         others?

         Server-side address     [variable]

         Client-side address     [variable]

   Version is the "link version", and dictates what types and formats

   of cells can be sent/received. It should be 1. A Tor connection is

   Timestamp is the OR's current Unix time (GMT).

   Each address contains Type/Length/Value as used in Section 5.4.

   This section lists all addresses that the OR has published and is

   listening to now -- we include them to block a man-in-the-middle

   The first address is the one that the OR has published and is

   listening to now -- we include it to block a man-in-the-middle

   attack on TLS that lets an attacker bounce traffic through his own

   computers to enable timing and packet-counting attacks.

   [Do we want to provide just one address? Do we want to be more

    general by accepting netmasks or something? -RD]

   The second address is the one that the client OP or OR has used to

   connect to the server -- it can be used to learn what your IP address

   is if you have no other hints.

   If we receive a HELLO cell with a version we do not recognize, we drop

   it. If we receive a HELLO cell with a version that is older than the