Netflow on bridging interfaces

Hello Guys,

I need some help on an advanced cisco configuration ....

i got a new 1841 which supports netflow, nbar and everything else. 1841 has 2 FastEthernet interfaces.

I was wondering if it would be possible to setup a bridge on 2 FastEthernet interfaces and have NetFlow activated on that bridged interface. My idea is to phisically segment a network with the router but keep all the logical configuration. 1841 would be 'in the middle' of the traffic but as a bridge and not as a router.

Well .... i could setup the bridge with no problems at all. I enabled netflow on the interfaces but got absolutely nothing. Seems that netflow does not sees bridged traffic, as it flows the router as layer 2 frames and netflow only sees layer 3 ip packets.

Have anybody done something similar to this configuration i wanna do and got it working ? I mean, got a cisco router with 2 FastEthernets as transparent bridge and successfully monitored that traffic with netflow ??

Thanks for any tips/hints on that.