Tcp Sink Monitor

The TCPSinkMonitor is simply the merge of the code of TCPSink and 
LossMonitor agents.
Agent was created by Luigi Iannone <iannone@rp.lip6.fr>

AGENT DETAILS

The TCPSinkMonitor is configurable like the TCPSink Agent, see NS-2 
Manual for futher details.
The statistics kept by the agent are the following:

recvbytes_ : Are the total number of bytes sent to the application layer.

nlost_     : Is the number of packets lost. This is calculated from the 
 	     sequence number in the header of TCP packets. If the received 
	     packet has a seqno higher than the expected it means that 
	     some packet get lost.

ndup_      : Number of duplicated packets. This may arrive if some acks 
             get lost. This is calculated from the sequence number in the 
  	     TCP header of the packet. If the received packet has a seqno 
	     lower than expected it means that source has re-sent some 
	     packets due to ack loss or timeout.

expected_ : Sequence number of the next expexted packet.

npkts_    : Total number of received packets (including duplicate).

lastPktTime_ : I s the time the last packet was received.

File tcp-sink-random.tcl is a simple, easy to understand,  
example of agent usage.




INSTALLING:

1. Copy files "tcp-sink-monitor.h" and "tcp-sink-monitor.cc" in 
   {NSHOME}/tools/ where {NSHOME} is the directory where you have 
   installed ns-2

2. Copy the following lines in your ns-default.tcl file:

  	#This are the copies of TCPSink values, to inizialize 
        #TCPSinkMonitor - GgX

	Agent/TCPSinkMonitor set sport_        0
	Agent/TCPSinkMonitor set dport_        0

	#XXX other kinds of sinks -> should reparent
	Agent/TCPSinkMonitor set packetSize_ 40
	Agent/TCPSinkMonitor set maxSackBlocks_ 3
	Agent/TCPSinkMonitor set ts_echo_bugfix_ false
	Agent/TCPSinkMonitor set generateDSacks_ false
	Agent/TCPSinkMonitor set qs_enabled_ false
	Agent/TCPSinkMonitor set RFC2581_immediate_ack_ true
	Agent/TCPSinkMonitor set bytes_ 0
	Agent/TCPSinkMonitor set recvbytes_ 0
	Agent/TCPSinkMonitor set nlost_ 0  
	Agent/TCPSinkMonitor set ndup_ 0
	Agent/TCPSinkMonitor set expected_ -1
	Agent/TCPSinkMonitor set npkts_ 0
	Agent/TCPSinkMonitor set seqno_ 0
	Agent/TCPSinkMonitor set lastPktTime_ 0.0

3. In Makefile.in add the following line to the list of OBJ_CC:

	tools/tcp-sink-monitor.o \

4. Reconfigure and compile your NS with the following commands:

	./configure
	make depend
	make

You can now run the tcp-sink-random.tcl file to see how it works.