package/iptables/files/firewall.user

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 . /etc/config/network
   5
   6 WAN="$wan_ifname"
   7 LAN="$lan_ifname"
   8
   9 iptables -F input_rule
  10 iptables -F output_rule
  11 iptables -F forwarding_rule
  12 iptables -t nat -F prerouting_rule
  13 iptables -t nat -F postrouting_rule
  14
  15 ### BIG FAT DISCLAIMER
  16 ## The "-i $WAN" is used to match packets that come in via the $WAN interface.
  17 ## it WILL NOT MATCH packets sent from the $WAN ip address -- you won't be able
  18 ## to see the effects from within the LAN.
  19
  20 ### Open port to WAN
  21 ## -- This allows port 22 to be answered by (dropbear on) the router
  22 # iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 22 -j ACCEPT
  23 # iptables        -A input_rule      -i $WAN -p tcp --dport 22 -j ACCEPT
  24
  25 ### Port forwarding
  26 ## -- This forwards port 8080 on the WAN to port 80 on 192.168.1.2
  27 # iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 8080 -j DNAT --to 192.168.1.2:80
  28 # iptables        -A forwarding_rule -i $WAN -p tcp --dport 80 -d 192.168.1.2 -j ACCEPT
  29
  30 ### DMZ
  31 ## -- Connections to ports not handled above will be forwarded to 192.168.1.2
  32 # iptables -t nat -A prerouting_rule -i $WAN -j DNAT --to 192.168.1.2
  33 # iptables        -A forwarding_rule -i $WAN -d 192.168.1.2 -j ACCEPT