LinuxQuestions.org - DMZ and iptables breaks my head!!! Avanced Help please!!!!

Please, somebody can help me???

I ask you apologize for shoot you with this "pack", but before come here I had saw lots of forums and I have used google more than in my life, for resolve this problem...

Could someone checking this script of iptables and says me what's the matter with the rules?? Why I only see the webpages from the IP address of LAN BUT NOT from outside, from Internet??

Now I'm get strong headaches, it's guilt of iptables on a DMZwebserver - LAN - INET from ISP.

Structure
|eth0: Internet ISP DHCP |
|eth1: router-firewall-squid-samba-LAN trusted |
|eth2: DMZ webserver-bind9 |

All the conectivity ethernet and TCP/IP works fine on the network.

After I spend three weeks with this trouble, my ignorance has won!!!!

I know that the IPTABLES script is very long and complex (that not means which to be good... ) BUT FOR THIS REASON I NEED HELP!!!!!!!!!!!
------------Paste script iptables---------------------------

#!/bin/sh

#Debug
#set -x

#
/sbin/iptables -F
/sbin/iptables -X
/sbin/iptables -Z
/sbin/iptables -t nat -F
/sbin/iptables -t nat -X
/sbin/iptables -t nat -Z
/sbin/iptables -t mangle -F
/sbin/iptables -t mangle -X
/sbin/iptables -t mangle -Z

# 1.1 Internet Configuration.
#

INET_IFACE="eth0"
INET_IP=200.xxx.xxx.89
INET_BROADCAST="255.255.255.255"
HTTP_IP=200.xxx.xxx.89
DNS_IP=200.xxx.xxx.89

#
# 1.2 Local Area Network configuration.
#
# your LAN's IP range and localhost IP. /24 means to only use the first 24
# bits of the 32 bit IP address. the same as netmask 255.255.255.0
#

LAN_IFACE="eth1"
LAN_IP="192.168.111.1"
LAN_IP_RANGE="192.168.111.0/24"

#
# 1.3 DMZ Configuration.
#

DMZ_HTTP_IP="192.168.222.22"
DMZ_DNS_IP="192.168.222.22"
DMZ_IP="192.168.222.21"
DMZ_IFACE="eth2"
#

#
# 1.4 Localhost Configuration.
#

LO_IFACE="lo"
LO_IP="127.0.0.1"

#
#

#NAMESERVER_1="x.x.x.x"
#NAMESERVER_2="x.x.x.x"
#BROADCAST="x.x.x.255"
#LOOPBACK="127.0.0.0/8"
CLASS_A="10.0.0.0/8"
CLASS_B="172.16.0.0/12"
CLASS_C="192.168.0.0/16"
CLASS_D_MULTICAST="224.0.0.0/4"
CLASS_E_RESERVED_NET="240.0.0.0/5"
P_PORTS="0:1023"
UP_PORTS="1024:65535"
TR_SRC_PORTS="32769:65535"
TR_DEST_PORTS="33434:33523"
#
# 1.5 IPTables Configuration.
#
IPTABLES="/sbin/iptables"
#
# 1.6 Other Configuration.
#
###########################################################################
#
# 2. Module loading.
#
#
# Needed to initially load modules
#
#
/sbin/depmod -a
#
#
# 2.1 Required modules
#
#
/sbin/modprobe ip_tables
/sbin/modprobe ip_conntrack
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_mangle
/sbin/modprobe iptable_nat
/sbin/modprobe ipt_LOG
/sbin/modprobe ipt_limit
/sbin/modprobe ipt_state
#
# 2.2 Non-Required modules
#
#/sbin/modprobe ipt_owner
#/sbin/modprobe ipt_REJECT
#/sbin/modprobe ipt_MASQUERADE
#/sbin/modprobe ip_conntrack_ftp
#/sbin/modprobe ip_conntrack_irc
#/sbin/modprobe ip_nat_ftp
#/sbin/modprobe ip_nat_irc
###########################################################################
#
# 3. /proc set up.
#
#
# 3.1 Required proc configuration
#
# Don't accept source routed packets. Attackers can use source routing to generate
# traffic pretending to be from inside your network, but which is routed back along
# the path from which it came, namely outside, so attackers can compromise your
# network. Source routing is rarely used for legitimate purposes.
echo "0" > /proc/sys/net/ipv4/conf/all/accept_source_route
# Disable broadcast
echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
# Disable ping
echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all
# Disable redir ping
echo "0" > /proc/sys/net/ipv4/conf/all/accept_redirects
# Register strange access, fakes ..
echo "1" > /proc/sys/net/ipv4/conf/all/log_martians
#
echo "1" > /proc/sys/net/ipv4/ip_forward
#
# 3.2 Non-Required proc configuration
#
#echo "1" > /proc/sys/net/ipv4/conf/all/rp_filter
#echo "1" > /proc/sys/net/ipv4/conf/all/proxy_arp
#echo "1" > /proc/sys/net/ipv4/ip_dynaddr
###########################################################################
#
# 4. rules set up.
#
##########################################################################
######
# 4.1 Filter table
#
# 4.1.1 Set policies
#
$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP
#
# 4.1.2 Create userspecified chains
#
# Create chain for bad tcp packets
#
$IPTABLES -N bad_tcp_packets
#
# Create separate chains for ICMP, TCP and UDP to traverse
#
$IPTABLES -N allowed
$IPTABLES -N tcp_packets
$IPTABLES -N udp_packets
$IPTABLES -N icmp_packets
#
# 4.1.3 Create content in userspecified chains
#
# bad_tcp_packets chain
#
$IPTABLES -A bad_tcp_packets -p tcp --tcp-flags SYN,ACK SYN,ACK \
-m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG \
--log-prefix "New not syn:"
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP
#
# allowed chain
#
$IPTABLES -A allowed -p TCP --syn -j ACCEPT
$IPTABLES -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A allowed -p TCP -j DROP
#
# FRAGMENTS
# I have to say that fragments scare me more than anything.
# Sending lots of non-first fragments was what allowed Jolt2 to effectively "drown"
# Firewall-1. Fragments can be overlapped, and the subsequent interpretation of such
# fragments is very OS-dependent (see this paper for details).
# I am not going to trust any fragments.
# Log fragments just to see if we get any, and deny them too.
$IPTABLES -A INPUT -i $INET_IFACE -f -j LOG --log-prefix "IPTABLES FRAGMENTS: "
$IPTABLES -A INPUT -i $INET_IFACE -f -j DROP
#
# SPOOFING
# Most of this anti-spoofing stuff is theoretically not really necessary with the flags we
# have set in the kernel above ........... but you never know there isn't a bug somewhere in
# your IP stack.
#
$IPTABLES -A INPUT -i $LO_IFACE -s $LO_IP -j ACCEPT
# Refuse spoofed packets pretending to be from your IP address.
$IPTABLES -A INPUT -i $INET_IFACE -s $INET_IP -j DROP
# Refuse packets claiming to be from a Class A private network.
$IPTABLES -A INPUT -i $INET_IFACE -s $CLASS_A -j DROP
# Refuse packets claiming to be from a Class B private network.
$IPTABLES -A INPUT -i $INET_IFACE -s $CLASS_B -j DROP
# Refuse packets claiming to be from a Class C private network.
$IPTABLES -A INPUT -i $INET_IFACE -s $CLASS_C -j DROP
# Refuse Class D multicast addresses. Multicast is illegal as a source address.
$IPTABLES -A INPUT -i $INET_IFACE -s $CLASS_D_MULTICAST -j DROP
# Refuse Class E reserved IP addresses.
$IPTABLES -A INPUT -i $INET_IFACE -s $CLASS_E_RESERVED_NET -j DROP
# Refuse packets claiming to be to the loopback interface.
# Refusing packets claiming to be to the loopback interface protects against
# source quench, whereby a machine can be told to slow itself down by an icmp source
# quench to the loopback.
$IPTABLES -A INPUT -i $INET_IFACE -d $LO_IP -j DROP
# Refuse broadcast address packets.
$IPTABLES -A INPUT -i $INET_IFACE -d $INET_BROADCAST -j DROP
#
# TCP rules
#
#WWW
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 80 -j allowed
#$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 443 -j allowed
#
# UDP ports
#
$IPTABLES -A udp_packets -p udp -j LOG
$IPTABLES -A udp_packets -p UDP -s 0/0 --dport 32768 -j DROP
$IPTABLES -A tcp_packets -p UDP -s 0/0 --dport 48639 -j DROP
$IPTABLES -A udp_packets -p udp -j DROP
#
# In Microsoft Networks you will be swamped by broadcasts. These lines
# will prevent them from showing up in the logs.
#
$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d $INET_BROADCAST \
--destination-port 135:139 -j DROP
#
# If we get DHCP requests from the Outside of our network, our logs will
# be swamped as well. This rule will block them from getting logged.
#
$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d 255.255.255.255 \
--destination-port 67:68 -j DROP
#
# ICMP rules
#
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 8 -j ACCEPT
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT
#
# 4.1.4 INPUT chain
#
# Bad TCP packets we don't want.
#
$IPTABLES -A INPUT -p tcp -j bad_tcp_packets

# Packets from LAN, DMZ or LOCALHOST
#

#
# From DMZ Interface to DMZ firewall IP
#
$IPTABLES -A INPUT -p ALL -i $DMZ_IFACE -d $DMZ_IP -j ACCEPT
#
# From LAN Interface to LAN firewall IP
#
$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_IP -j ACCEPT
#
# Rules for special networks not part of the Internet
#
$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -s $LAN_IP_RANGE -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LO_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LAN_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP -j ACCEPT
#
# Special rule for DHCP requests from LAN, which are not caught properly
# otherwise.
#
#$IPTABLES -A INPUT -p UDP -i $LAN_IFACE --dport 67 --sport 68 -j ACCEPT
#
# Rules for incoming packets from the internet.
#
$IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED \
-j ACCEPT
$IPTABLES -A INPUT -p TCP -i $INET_IFACE -j tcp_packets
$IPTABLES -A INPUT -p UDP -i $INET_IFACE -j udp_packets
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets
#
# If you have a Microsoft Network on the outside of your firewall, you may
# also get flooded by Multicasts. We drop them so we do not get flooded by
# logs
$IPTABLES -A INPUT -i $INET_IFACE -d 224.0.0.0/8 -j DROP
$IPTABLES -A INPUT -p tcp -s 0/0 --dport 32768 -j DROP
$IPTABLES -A INPUT -p udp -s 0/0 --dport 48639 -j DROP
#
# Log weird packets that don't match the above.
#
$IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \
--log-level DEBUG --log-prefix "IPT INPUT packet died: "
#
# 4.1.5 FORWARD chain
#
# Bad TCP packets we don't want
#
#$IPTABLES -A FORWARD -p tcp -j bad_tcp_packets
#
# DMZ section
#
# General rules
#
$IPTABLES -A FORWARD -i $DMZ_IFACE -o $INET_IFACE -j ACCEPT
$IPTABLES -A FORWARD -i $INET_IFACE -o $DMZ_IFACE -m state \
--state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $LAN_IFACE -o $DMZ_IFACE -j ACCEPT
$IPTABLES -A FORWARD -i $DMZ_IFACE -o $LAN_IFACE -m state \
--state ESTABLISHED,RELATED -j ACCEPT
#
# HTTP server
#
$IPTABLES -A FORWARD -p TCP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_HTTP_IP \
--dport 80 -j allowed
$IPTABLES -A FORWARD -p ICMP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_HTTP_IP \
-j icmp_packets
#
# DNS server
#
$IPTABLES -A FORWARD -p TCP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_DNS_IP \
--dport 53 -j allowed
$IPTABLES -A FORWARD -p UDP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_DNS_IP \
--dport 53 -j ACCEPT
$IPTABLES -A FORWARD -p ICMP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_DNS_IP \
-j icmp_packets
#
#
# Accept the packets we actually want to forward
#
$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 80 -j ACCEPT
#DNS
#$IPTABLES -A FORWARD -p tcp --dport 53 -j ACCEPT
#
# Log weird packets that don't match the above.
#
$IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG \
--log-level DEBUG --log-prefix "IPT FORWARD packet died: "
#
# 4.1.6 OUTPUT chain
#
# Bad TCP packets we don't want.
#
$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets
#
# Special OUTPUT rules to decide which IP's to allow.
#
$IPTABLES -A OUTPUT -p ALL -s $LO_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $INET_IP -j ACCEPT
$IPTABLES -A OUTPUT -p tcp --dport 32768 -j DROP
$IPTABLES -A OUTPUT -p udp --dport 32768 -j DROP
$IPTABLES -A OUTPUT -p tcp --dport 48639 -j DROP
$IPTABLES -A OUTPUT -p udp --dport 48639 -j DROP
$IPTABLES -A OUTPUT -p tcp --sport 32768 -j DROP
$IPTABLES -A OUTPUT -p udp --sport 32768 -j DROP
$IPTABLES -A OUTPUT -p tcp --sport 48639 -j DROP
$IPTABLES -A OUTPUT -p udp --sport 48639 -j DROP

#
# Log weird packets that don't match the above.
#
$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \
--log-level DEBUG --log-prefix "IPT OUTPUT packet died: "
#
# 4.2 nat table
#
# 4.2.4 PREROUTING chain

###SQUID TRANSPARENT PROXY
$IPTABLES -t nat -A PREROUTING -i $LAN_IFACE -s $LAN_IP_RANGE -d $HTTP_IP -p tcp --dport 80 -j REDIRECT --to-ports 3128
#
#WEBSERVER2SQUID#
$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE -d $HTTP_IP --dport 80 \
-j DNAT --to-destination $DMZ_HTTP_IP
$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE -d $DNS_IP --dport 53 \
-j DNAT --to-destination $DMZ_DNS_IP
$IPTABLES -t nat -A PREROUTING -p UDP -i $INET_IFACE -d $DNS_IP --dport 53 \
-j DNAT --to-destination $DMZ_DNS_IP
#
#
#POSTROUTING CHAIN
#
$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP
#
-------------------END PASTE------------------------------------------

Thanks in advance