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[ns] ftp with FullTCP: packet size



I am running simulations of a ftp application over fulltcp. I want to set the 
packet sizes it sends with to 1000 bytes. However, even though I have set both 
the fulltcp agent to packetsize 1000 bytes:

set tsnd0 [new Agent/TCP/FullTcp]
$tsnd0 set packetSize_ 1000

and the ftp application to 1000 bytes:

set ftp0 [new Application/FTP]
$ftp0 attach-agent $tsnd0
$ftp0 set packetSize_ 1000

The protocol still sends in packets of 576 bytes (with setup packets of 40 
bytes).

Is there another variable that I should be setting to 1000 bytes?

Thank you.
Julian