iptables -A INPUT -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT 
iptables -A INPUT -d 172.18.3.47 -i eth0 -p tcp -m multiport --dports 80,443,8000 -m state --state NEW -j ACCEPT 
iptables -A INPUT -i lo -j ACCEPT 
iptables -A INPUT -d 172.18.3.47 -i eth0 -p tcp -m tcp --dport 22 -m state --state NEW -j ACCEPT 
iptables -A INPUT -d 172.18.3.47 -i eth0 -p icmp -m icmp --icmp-type 8 -j ACCEPT