In line transparent pfsense with Snort

[ful56_uk]

hi

can anyone advise me please, looking to put a pfsense box in front of my firewall just for IDS/IPS with Snort. i want to run it in line transparent so it doesn't interfere with current firewall setup.

I have setup three nic's WAN to plug into the router, OPT1 for plugging into the firewall and a management NIC.

i have put  in a bridged connection for WAN and OPT1, is there any other config i need to do on the pfsense box to get this to work?