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[ns] curious behaviour of the FTP application in ns2.1b6



Hi,
I have observed a curious behaviour of the FTP application in ns (Version
2.1b6) in conjunction with the (initial) congestion window size of a TCP agent.
With

$tcp set cwnd_ 1
$ftp produce $number_of_packets$

everything works as expected, i.e. the FTP application produces $number_of_packets
packets for the TCP agent. But, for example, with

$tcp set cwnd_ 5
$ftp produce $number_of_packets$

the FTP application produces more than $number_of_packets packets for the TCP
agent. This applies also for other cwnd_ values greater than 1. The same
behaviour of the FTP application can be observed with the functions produce and
send/sendmore. How can this be explained? Any ideas?

Best regards,
Michael Savoric
 
[email protected]