tcp proxy for middle man attack

[sumit soni <sk10_0 () yahoo com>]

Hi ,

I wonder if you know any tool similar to Paros Proxy
but for TCP  
Server.
 I´m looking for a proxy for TCP  traffic, where I can
easly do man in 
the
 middle attacks just changing what I want and leaving
the rest.
 
netwokstuff looks good but it not keep connection open
& not provides instant capability to change traffic .
that is what I need.

regards
--Sk

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