package/base-files/default/etc/firewall.user

   1 #!/bin/sh
   2 . /etc/functions.sh
   3 . /etc/network.overrides
   4 [ "$FAILSAFE" != "true" -a -e /etc/config/network ] && . /etc/config/network
   5
   6 WAN=$(nvram get wan_ifname)
   7 LAN=$(nvram get 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" literally means packets that came in over the $WAN interface;
  17 ### this WILL NOT MATCH packets sent from the LAN to the WAN address.
  18
  19 ### Allow SSH on the WAN interface
  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 # iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 22 -j DNAT --to 192.168.1.2
  25 # iptables        -A forwarding_rule -i $WAN -p tcp --dport 22 -d 192.168.1.2 -j ACCEPT
  26
  27 ### DMZ (should be placed after port forwarding / accept rules)
  28 # iptables -t nat -A prerouting_rule -i $WAN -j DNAT --to 192.168.1.2
  29 # iptables        -A forwarding_rule -i $WAN -d 192.168.1.2 -j ACCEPT