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[ns] how to use TCP/Sack1 to simulate HTTP application?



Hi:
I have a problem with NS:

I want to simulate a HTTP appliation with TCP/Sack1 as its TCP model,
The problem is :
The sender seems not to be able to understand the SACK message from
receiver. After the sender sends the first data packet to receiver and
receiver acks, the connection will keep idle.

Can anyone tell me what is wrong ? 
Does NS support the combination of HTTP and TCP/Sack?


Thanks in advance

Qian