Question regarding Bridge

A quick question. I have bridged the lan interface with the wireless lan. There is a DHCP server on my lan. In which interface do I setup the IP that will be used as a gateway from the clients? It does not seem to make any difference if I set it up on the Lan interface or the bridge interface. In both cases all clients (wirelless or not) are working
Another question.
When I try to mark packets with the Lan interface as source and destination port 80, nothing is marked. I have to use the bridge interface as the source interface. But when I torch the Lan interface I can clearly see the packets. Use firewall is enabled on the bridge. This happens with the gateway ip setup in the lan interface or the bridge interface.

First question. Works same, but correct is to put all in the bridge, not the ether..
Second: torch shows the real interface of the packet.. First the packet is in ether and later the bridge.

Thanks for the answer. So, to sum it up. When you add an interface to a bridge, you have to stop using that interface in your mangle rules and use the bridge interface instead. Is that correct?

Yes, but in bridge/filter you will have things to play too.