Excelent, chrism01 !!!
It work's !
(ha, yust like rookie useed to say).
TNX "chrism01" it is simple and efective, way I like it.
Excellent strategy, of course I had to change my part, because "box3" is cisco router, and it is not linux than IOS. I stole a TCP port on the cisco and forwarded it to the "box4" port 22...