openwrt/package/iptables/files/firewall.user

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