### Enable Packet Forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

### Remove all previous rules, and delete any user defined chains
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X

### Set the default policies
iptables -P INPUT   DROP
iptables -P OUTPUT  ACCEPT
iptables -P FORWARD DROP

### Loopback device OK
iptables -A INPUT  -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

### Mascuarade home lan packets
#iptables -t nat -A POSTROUTING -o ppp0 -s 10.103.0.62/255.255.255.255 -j MASQUERADE
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

### Input rules
iptables -A INPUT -i ppp0 -j ACCEPT
iptables -A INPUT -i eth0 -s 0/0 -d 0.0.0.0/0 -j DROP
iptables -A INPUT -i eth0 -s 10.103.0.62/255.255.255.255 -d 0.0.0.0/0 -j ACCEPT
iptables -A INPUT -i eth0 -s 0/0  -d 10.0.0.0/8 -j ACCEPT