Transparent Proxy + Transparent Firewall bridge possible?

[tmp]

Dear community,

currently I'm setting up an opnsense-appliance in a network where I am unable to change any network configuration except for the opnsense appliance.

Given setup:

Router (plastic crap-> 192.168.1.x) ->>>> OPNSENSE (Proxy + eventually IDS) ->>>>> Server / Wireless AP (192.168.1.x).


Actually i got opnsense running in transparent filtering bridge mode and can access the internet from the server without touching the network configuration.
But I'm stuck in setting the transparent proxy. I configured squid to listen on all interfaces (for testing). But this doesn't work because there are no log entries inside the squid-logfile so the traffic doesn't pass through it.
For which interface do I need to configure the NAT-/FW-Rules?

Actually I got 3 NICs and one software bridge inside the machine:
WAN
LAN (management interface)
OPT 1 (bridged to WAN interface)
and OPT 2 (Bridge between WAN and OPT1).


I tried to set the NAT-Rules for OPT1 / WAN and OPT2 but nothing is working. Is my configuration just wrong or does opnsense not support Transparent Proxy when the device is set up as a transparent filtering bridge?


Regards

tmp