Adhoc On-demand Distance Vector (AODV) 

Accept from the user as command line arguments on the client side:

1. the D flag described below
2. Number of messages to be sent from client to server
3. Server IP address

Route Request (RREQ) Message Format -- Sent from client to server.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |J|R|G|D|U|   Reserved          |   Hop Count   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            RREQ ID                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Destination IP Address                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Destination Sequence Number                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Originator IP Address                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Originator Sequence Number                   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The format of the Route Request message is illustrated above, and
   contains the following fields:

      D              Destination only flag; indicates only the
                     destination may respond to this RREQ.
NOTE: Accept a command line argument which will tell you whether to set this field or not.
In the server, extract this value and print it.

      Reserved       Sent as 0; ignored on reception.

      Hop Count      Set to 0.

      RREQ ID        A sequence number uniquely identifying the
                     particular RREQ. Increase it monotonically. Print it in server.

      Destination IP Address
                     The IP address of the server.

      Destination Sequence Number
                     The latest sequence number received in the past.
                     Use 0 first time and subsequent messages from client should use the
                     value returned by server in previous round.

      Originator IP Address
                     The IP address of the client.

      Originator Sequence Number
                     The current sequence number - monotonically increasing for client.

Route Reply (RREP) Message Format -- Sent from server to client

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |R|A|    Reserved     |Prefix Sz|   Hop Count   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Destination IP address                    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Destination Sequence Number                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Originator IP address                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                           Lifetime                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The format of the Route Reply message is illustrated above, and
   contains the following fields:

      Type          2

      A             Acknowledgment required; 

      Reserved      Sent as 0; ignored on reception.

      Prefix Size   Set it to zero

      Hop Count     The number of hops from the Originator IP Address
                    to the Destination IP Address. Set it to any number
                    and print this in client.

      Destination IP Address
                    The IP address of the server for which a route
                    is supplied.

      Destination Sequence Number
                    The destination sequence number associated to the
                    route - server increases this value monotonically
                    when replying to a route request from client.

      Originator IP Address
                    The IP address of the node which originated the RREQ (client)
                    for which the route is supplied.

      Lifetime      Set to 0.


Group 1:
Implement as a TCP concurrent server with processes

Group 2:
Implement as a TCP concurrent server with threads

Group 3:
Implement as a TCP iterative server with select