diff --git a/openwrt/package/base-files/default/etc/init.d/S45firewall b/openwrt/package/base-files/default/etc/init.d/S45firewall
index 188b9aaa8..c9986011a 100755
--- a/openwrt/package/base-files/default/etc/init.d/S45firewall
+++ b/openwrt/package/base-files/default/etc/init.d/S45firewall
@@ -5,7 +5,8 @@ ${FAILSAFE:+exit}
 
 . /etc/functions.sh
 . /etc/network.overrides
-[ -e /etc/config/network] && . /etc/config/network
+[ -e /etc/config/network ] && . /etc/config/network
+
 WAN=$(nvram get wan_ifname)
 LAN=$(nvram get lan_ifname)
 
@@ -37,7 +38,7 @@ iptables -t nat -N postrouting_rule
   iptables -A INPUT -j input_rule
 
   # allow
-  iptables -A INPUT -i \! $WAN	-j ACCEPT	# allow from lan/wifi interfaces 
+  iptables -A INPUT ${WAN:+-i \! $WAN}	-j ACCEPT	# allow from lan/wifi interfaces 
   iptables -A INPUT -p icmp	-j ACCEPT	# allow ICMP
   iptables -A INPUT -p gre	-j ACCEPT	# allow GRE
 
@@ -81,7 +82,7 @@ iptables -t nat -N postrouting_rule
 
   # allow
   iptables -A FORWARD -i br0 -o br0 -j ACCEPT
-  iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
+  [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
 
   # reject (what to do with anything not allowed earlier)
   # uses the default -P DROP
@@ -89,7 +90,7 @@ iptables -t nat -N postrouting_rule
 ### MASQ
   iptables -t nat -A PREROUTING -j prerouting_rule
   iptables -t nat -A POSTROUTING -j postrouting_rule
-  iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
+  [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
 
 ## USER RULES
 [ -f /etc/firewall.user ] && . /etc/firewall.user
diff --git a/openwrt/target/linux/package/openwrt/files/network.overrides.ar7 b/openwrt/target/linux/package/openwrt/files/network.overrides.ar7
index dc58a7e59..e857d5b5f 100644
--- a/openwrt/target/linux/package/openwrt/files/network.overrides.ar7
+++ b/openwrt/target/linux/package/openwrt/files/network.overrides.ar7
@@ -7,7 +7,7 @@
 [ -f /etc/sysconf ] && . /etc/sysconf
 
 DEFAULT_lan_proto="static"
-DEFAULT_lan_ifname="eth0"
+DEFAULT_lan_ifname="br0"
 DEFAULT_lan_ifnames="eth0"
 DEFAULT_lan_ipaddr=${BR2_SYSCONF_FAILSAFE_IP:-"192.168.1.1"}
 DEFAULT_lan_netmask=${BR2_SYSCONF_FAILSAFE_NETMASK:-"255.255.255.0"}