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[ns] FullTCP Question



Hello,

I have used the example of FullTCP in the NS Notes and Documentation.
However I got the following error. Can you let me know what it is. It
should be a trivial one. I have changes the topology and
source/destination but the the GAP between SYN(#) and ACK(seq #) is always 
same (56).

Thank you for your jelp. 
 

10.153309: FullTcpAgent::recv(_o882): bad ACK (97) for our SYN(41)
10.165919: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)
16.011479: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)
16.145340: FullTcpAgent::recv(_o882): bad ACK (97) for our SYN(41)
16.156771: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)
28.010959: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)
28.146360: FullTcpAgent::recv(_o882): bad ACK (97) for our SYN(41)
28.157531: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)
52.011539: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)
52.146320: FullTcpAgent::recv(_o882): bad ACK (97) for our SYN(41)
52.157931: FullTcpAgent::recv(_o883) got packet lacking ACK (seq 97)