*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT

*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A PREROUTING -i eth0 -d {PUBLIC_IP} -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.128.0.3:80
-A PREROUTING -i eth0 -d {PUBLIC_IP} -p tcp -m tcp --dport 443 -j DNAT --to-destination 10.128.0.3:443
-A POSTROUTING -d 10.128.0.3 -o eth1 -p tcp -m tcp --dport 80 -j SNAT --to-source 10.128.0.2
-A POSTROUTING -d 10.128.0.3 -o eth1 -p tcp -m tcp --dport 443 -j SNAT --to-source 10.128.0.2
-A POSTROUTING -s 10.128.0.2 -o eth0 -j SNAT --to-source {PUBLIC_IP}
-A POSTROUTING -s 10.128.0.0/20 ! -d 10.128.0.0/20 -j MASQUERADE
COMMIT

*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
:FILTERS - [0:0]
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 5/sec -j ACCEPT
-A INPUT -i eth1 -m conntrack --ctstate NEW -s 10.128.0.0/20 -j ACCEPT
-A INPUT -j FILTERS
-A INPUT -j DROP
-A FORWARD -o eth1 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth1 -o eth1 -m conntrack --ctstate NEW -s 10.128.0.0/20 -j ACCEPT
-A FORWARD -o eth0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth1 -o eth0 -m conntrack --ctstate NEW -s 10.128.0.0/20 -j ACCEPT
-A FORWARD -i eth0 -o eth1 -j FILTERS
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -o eth0 -j ACCEPT
-A OUTPUT -o eth1 -j ACCEPT
-A FILTERS -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FILTERS -p tcp -m conntrack --ctstate NEW -m tcp --syn --dport 22 -j ACCEPT 
-A FILTERS -p tcp -m conntrack --ctstate NEW -m tcp --syn --dport 80 -j ACCEPT
-A FILTERS -p tcp -m conntrack --ctstate NEW -m tcp --syn --dport 443 -j ACCEPT
-A FILTERS -p udp -m conntrack --ctstate NEW -m udp --dport 51820 -j ACCEPT
-A FILTERS -p udp -m conntrack --ctstate NEW -m udp --dport 51821 -j ACCEPT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 1719 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 1720 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 1723 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 5060 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 5061 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 6566 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 8080 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 8443 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 8880 -j REJECT
-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 10080 -j REJECT
-A FILTERS -m conntrack --ctstate INVALID -j DROP
-A FILTERS -j REJECT
COMMIT