> Can I use m0n0wall like a bridge ?

Yes

> When I put two IP adresses (one on LAN and one on WAN) which are on the
> same network (like 192.168.1.1/16 and 192.168.2.2/16), the firewall
> doesn't work. But when I change one IP adress and put it on other
> network, it's work fine ?

Check out the "bridging" functionality.  You'll also need to enable filtering.


-- 
Sorry, she meant to say "stripped naked and thrown out an airlock"
I'm sorry for any confusion this may have caused.
 -- President Sheridan, B5