[ns] TCP information at Web Server/Cache/Client

[Tatsuhiko <genuine@ma4.justnet.ne.jp>]

Hi!

I posted the similar question to this ML.
I'm newbie for ns and building simulation program about Web Cache.

I'd like to observe the behavior of TCP connection at Web Cache by
simulation which consist of many clients and servers.
Anyway, to get the TCP information, I'm hacking the http-cache.tcl
or the code about HTTP and I don't understand some point.

1) Isn't Web Server/Cache/Client working on TCP ??
   I tried to change window size of the connection which is treated at
   each Web application, however, I can't get the change effect by 
   http.log.

2) When I try to get or change TCP information at Web Cache, where
   should hack and modify the code in ns-2 ??

3) Is there other way to simulate below situation? I don't care the
   cache replace policy.

   c1 ----------- Cache -----------s1
   c2 -----------       -----------s2 
      -----------       -----------
   cn -----------       -----------sn 
          ↑I'd like to see the connection information about TCP 

Thanks in advance kindly advice.

Tatsu;