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[ns] TCP Window setting

How realisitic is the default TCP window setting (compared with FreeBSD
implementations):

Agent/TCP set window_ 20

and this parameter's influence on the dynamics of ssthresh_ in the ns
implementation:

int TcpAgent::window()
{
     return (cwnd_ < wnd_ ? (int)cwnd_ : (int)wnd_);
}

It seems to unnecessarily restrict the transmission rate of TCP, unless
of cause this accurately reflects actual implementations of TCP.

Sven.