[ASK] Silent Interface??

[Rachmat Hidayat Al-Anshar <rachmat_hidayat_02 () yahoo com>]

Hi guys...

Straightforward, I just wanna know deeper about "silent interface" that we might use on sensors. 
I have a topology like this:

                                                    y
INTERNET ---- gateway ----- sensor
                              |                | x
                              |                     |
                                +-------- switch --------- gateway ------- INTRANET
                                                        |
                                                        |
                                            -------------
                                            |        |        |
                                        (servers on DMZ)

is it true that we can use the sensor interface silently monitoring the traffic flowing accross the switch ?
(marked with x)??

if the answers is correct, then how can i do that??

is it with use the dhcp on in? or what??

Thanks in advance 
Any response will greatly appreciated
Mat (^^)




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