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Bascially, the /etc/network/interfaces file you have on default boot correctly implements this.
Here’s the correct bridge br0 configuration:

auto br0
iface br0 inet static
address #static address and netmask assignment
bridge_stp off #disables spanning-tree protocol features
bridge_fd 0 #forwarding begins as soon as interface is up
bridge_ports lan0 lan1 lan2 lan3 #lan ports are bridged together
#dnsmasq is a dns and dhcp server that listens on br0 interface and will give IP addresses from specified range to the systems in LAN
post-up dnsmasq –interface=br0 –except-interface=lo –bind-interfaces — dhcp-range=,,12h
#enables routing (communication between lan interfaces and wan through br0)
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
#performs Network Address Translation (NAT) between WAN and LAN
post-up iptables -t nat -A POSTROUTING -s ’’ -o wan -j MASQUERADE
#disables routing, NAT and dhcp server if bridge is set down
post-down iptables -t nat -D POSTROUTING -s ’’ -o wan -j MASQUERADE
post-down echo 0 > /proc/sys/net/ipv4/ip_forward post-down pkill dnsmasq

With this, the Topaz switch is used for forwarding (can be verified by listening to the eth0 interface with tcpdump for example. No packet should be visible as not treated by the OS). Other interfaces can be auto configured:

auto eth0
iface eth0 inet manual
up /sbin/ifconfig $IFACE promisc up
down /sbin/ifconfig $IFACE down

auto lan0
iface lan0 inet manual

auto lan1
iface lan1 inet manual

auto lan2
iface lan2 inet manual

auto lan3
iface lan3 inet manual

Hope this helps.

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