Olá Gilberto,
$IPTABLES -A FORWARD -s 192.168.206.0 -d 192.168.1.0 -j ACCEPT $IPTABLES -A FORWARD -s 192.168.1.0 -d 192.168.206.0 -j ACCEPTiptables -A FORWARD -i br0 -o br1 -j ACCEPTiptables -A FORWARD -i br1 -o br0 -j ACCEPT