Subnetting

I currently have two seperate networks connected to a gateway with two Ethernet interfaces. The gateway has connection to internet via ppp link. Certain things(such as samba) does not work across the gateway. So I am thinking about subnetting but having problem with broadcast address. I want the broadcast message to travel across the router. Here is what I think the interface configurations should be at the router

Iface IP address Netmask Bcast
eth0 192.168.0.1 255.255.255.128 192.168.0.127(?)
eth1 192.168.0.129 255.255.255.128 192.168.0.255(?)

Now what should be the Broadcast address and netmask for
the machines on each subnet? For a machine in the subnet connected to eth0 I am thinking of a netmask of 255.255.255.255. If i use a broadcast address 192.168.0.127, a machine connected to eth1 won't receive the message or will it?
Also how is ip_forwarding different from bridging? I can't figure
it out, seem to be the same thing to me. I currently use
forwarding.

Comments/suggesstions/alternative ideas will be greatly appreciated. Thanks.

jonaki