ha, ha, you can't read this

#!/bin/sh

# This is /etc/network/if-pre-up.d/iptables. It starts the firewall immediately prior to any network interface coming online.

WAN=p4p1

LAN=p1p1

/sbin/iptables-restore << EOF

*nat

:PREROUTING ACCEPT [0:0]

:INPUT ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

:POSTROUTING ACCEPT [0:0]

-A POSTROUTING -o $WAN -j MASQUERADE

# NAT pinhole: HTTP from WAN to LAN

-A PREROUTING -p tcp -m tcp -i $WAN --dport 80 -j DNAT --to-destination 192.168.99.100:80

COMMIT

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

# Service rules

# basic global accept rules - ICMP, loopback, traceroute, established all accepted

-A INPUT -s 127.0.0.0/8 -d 127.0.0.0/8 -i lo -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -m state --state ESTABLISHED -j ACCEPT

# enable traceroute rejections to get sent out

-A INPUT -p udp -m udp --dport 33434:33523 -j REJECT --reject-with icmp-port-unreachable

# DNS - accept from LAN

-A INPUT -i $LAN -p tcp --dport 53 -j ACCEPT

-A INPUT -i $LAN -p udp --dport 53 -j ACCEPT

# SSH - accept from LAN

-A INPUT -i $LAN -p tcp --dport 22 -j ACCEPT

# DHCP client requests - accept from LAN

-A INPUT -i $LAN -p udp --dport 67:68 -j ACCEPT

# drop all other inbound traffic

-A INPUT -j DROP

# Forwarding rules

# forward packets along established/related connections

-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT

# forward from LAN (p1p1) to WAN (p4p1)

-A FORWARD -i $LAN -o $WAN -j ACCEPT

# allow traffic from our NAT pinhole

-A FORWARD -p tcp -d 192.168.99.100 --dport 80 -j ACCEPT

# drop all other forwarded traffic

-A FORWARD -j DROP

COMMIT

EOF