Hi there,
first of all: sorry about my bad english, i´m a dumb german 
....
I´ve got the problem that i put a webserver into my DMZ (192.168.2.2) and cannot even ping it from the LAN (192.168.1.0). It only works when sending a ping directly from the router.
I´ve been searching for the "error" for ours now but there´s nothing i can find.
nvram show | grep vlan2
size: 2394 bytes (30374 left)
vlan2ports=0 5
vlan2hwname=et0
dmz_ifname=vlan2/etc/firewall.user
#!/bin/sh
. /etc/functions.sh
WAN=$(nvram get wan_ifname)
LAN=$(nvram get lan_ifname)
DMZ=$(nvram get dmz_ifname)
WIFI=$(nvram get wifi_ifname)
iptables -F input_rule
iptables -F output_rule
iptables -F forwarding_rule
iptables -t nat -F prerouting_rule
iptables -t nat -F postrouting_rule
## allow input/forwarding for the VPN interfaces, see http://openvpn.net/faq.html#firewall
## also needs ip_forward, see http://openvpn.net/faq.html#ip-forward and http://forum.openwrt.org/viewtopic.php?pid=20428#p204
iptables -A INPUT -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -j ACCEPT
iptables -A INPUT -i tap+ -j ACCEPT
iptables -A FORWARD -i tap+ -j ACCEPT
### BIG FAT DISCLAIMER
## The "-i $WAN" is used to match packets that come in via the $WAN
#interface.
## it WILL NOT MATCH packets sent from the $WAN ip address -- you
#won.t be able
## to see the effects from within the LAN.
### Open port to WAN
## -- This allows port 22 to be answered by (dropbear on) the router
# iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 22 -j
#ACCEPT
# iptables -A input_rule -i $WAN -p tcp --dport 22 -j
#ACCEPT
### Port forwarding
## -- This forwards port 8080 on the WAN to port 80 on 192.168.2.2
iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 8080 -j DNAT --to 192.168.2.2:80
iptables -A forwarding_rule -i $WAN -p tcp --dport 8080 -d 192.168.2.2 -j ACCEPT
iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 80 -j DNAT --to 192.168.2.2:80
iptables -A forwarding_rule -i $WAN -p tcp --dport 80 -d 192.168.2.2 -j ACCEPT
### DMZ (should be placed after port forwarding / accept rules)
iptables -t nat -A prerouting_rule -i $WAN -j DNAT --to 192.168.2.2
iptables -A forwarding_rule -i $WAN -d 192.168.2.2 -j ACCEPT
# Permit Other Nets access to Internet
iptables -A forwarding_rule -i $DMZ -o $WAN -j ACCEPT
iptables -A forwarding_rule -i $WIFI -o $WAN -j ACCEPT
# Permit LAN to access other nets
iptables -A forwarding_rule -i $LAN -o $DMZ -j ACCEPT
iptables -A forwarding_rule -i $LAN -o $WIFI -j ACCEPT
#Beispiel für icmp von WIFI auf Computer im LAN
#iptables -A forwarding_rule -i $LAN -p icmp -d 192.168.2.2 -j ACCEPT
#VPN auf Server: Port 443
iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 443 -j DNAT --to 192.168.1.1:443
iptables -A forwarding_rule -i $WAN -p tcp --dport 443 -d 192.168.1.1 -j ACCEPT/etc/init.d/S35firewall
#!/bin/sh
## Please make changes in /etc/firewall.user
. /etc/functions.sh
WAN="$(nvram get wan_ifname)"
WANDEV="$(nvram get wan_device)"
LAN="$(nvram get lan_ifname)"
[ -n "$(nvram get wifi_ifname)" ] && WIFI="$(nvram get lan_ifnames | grep -q $(nvram get wifi_ifname) || nvram get wifi_ifname)"
[ "$WAN" = "$WIFI" ] && WIFI=""
WIFI_LAN=${WIFI:+$(nvram get wifi_wifi2lan)}
## CLEAR TABLES
for T in filter nat; do
iptables -t $T -F
iptables -t $T -X
done
iptables -N input_rule
iptables -N input_wan
iptables -N output_rule
iptables -N forwarding_rule
iptables -N forwarding_wan
iptables -t nat -N NEW
iptables -t nat -N prerouting_wan
iptables -t nat -N prerouting_rule
iptables -t nat -N postrouting_rule
iptables -N LAN_ACCEPT
[ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN
[ -z "$WANDEV" -o "$WANDEV" = "$WAN" ] || iptables -A LAN_ACCEPT -i "$WANDEV" -j RETURN
iptables -A LAN_ACCEPT -j ACCEPT
### INPUT
### (connections with the router as destination)
# base case
iptables -P INPUT DROP
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A INPUT -j input_rule
iptables -A INPUT -i $WAN -j input_wan
# allow
iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces
iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
iptables -A INPUT -p gre -j ACCEPT # allow GRE
# reject (what to do with anything not allowed earlier)
iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
### OUTPUT
### (connections with the router as source)
# base case
iptables -P OUTPUT DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A OUTPUT -j output_rule
# allow
iptables -A OUTPUT -j ACCEPT #allow everything out
# reject (what to do with anything not allowed earlier)
iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
### FORWARDING
### (connections routed through the router)
# base case
iptables -P FORWARD DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A FORWARD -j forwarding_rule
iptables -A FORWARD -i $WAN -j forwarding_wan
# allow
iptables -A FORWARD -i $LAN -o $LAN -j ACCEPT
[ -n "$WIFI" ] && iptables -A FORWARD -i $WIFI -o $WIFI -j ACCEPT
[ "$WIFI_LAN" = "1" ] && [ -n "$WIFI" ] && {
iptables -A FORWARD -i $LAN -o $WIFI -j ACCEPT
}
iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
[ -n "$WIFI" ] && iptables -A FORWARD -i $WIFI -o $WAN -j ACCEPT
# reject (what to do with anything not allowed earlier)
# uses the default -P DROP
### MASQ
iptables -t nat -A PREROUTING -m state --state NEW -p tcp -j NEW
iptables -t nat -A PREROUTING -j prerouting_rule
iptables -t nat -A PREROUTING -i $WAN -j prerouting_wan
iptables -t nat -A POSTROUTING -j postrouting_rule
iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
iptables -t nat -A NEW -m limit --limit 50 --limit-burst 100 -j RETURN && \
iptables -t nat -A NEW -j DROP
## USER RULES
[ -f /etc/firewall.user ] && . /etc/firewall.user
[ -e /etc/config/firewall ] && {
awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/config/firewall | ashFor a idea i´d be soo thankfull!