Can an ethernet bridge be detected ?

Hi,

I'm wondering when I setup an ethernet bridge like this:

.--------------. .---------. .------.
|workstation pc|------------|bridge pc|------------|router|---------internet
'--------------' eth0'---------'eth1 '------'

-using these commands on 'bridge pc':
||ifconfig eth0 0.0.0.0
||ifconfig eth1 0.0.0.0
brctl addbr bridge0
brctl addif eth0
brctl addif eth1
ifconfig bridge0 up

Is there a way to detect this bridge? Is the 'bridge pc' totally transparent / invisible from both sides?

<
Thank you for your help.


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