iptables 設定メモ
-P INPUT DROP -P FORWARD DROP -P OUTPUT ACCEPT -A INPUT -i br0 -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -i ppp0 -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -d 192.168.1.0/24 -j ACCEPT -A FORWARD -i br0 -j ACCEPT -A FORWARD -i lo -j ACCEPT -A FORWARD -i ppp0 -m state --state RELATED,ESTABLISHED -j ACCEPT -t nat -A POSTROUTING -s 192.168.1.0/24 -o ppp0 -j MASQUERADE