hi guys, I'd like to ask you for your help regarding my project,
simple thing sniffing using tools like snort

here is the simple overview:
modem ---- Router --- sniffer's Eth0 <=BRIDGE=> sniffer's Eth1--- Switch --Localnet

two network cards on a machine with linux, I thought about using Ubuntu, two interfaces bridged(e.g. with brctl), so the machine will be transparent for the rest of the network,
this machine would be between router and a switch

Do you think I could use a laptop with additional network card on usb ?
now the question is how about support in linux for drivers etc

What do you think about this idea ?
thanks in advance