cannot access my external ip

[Duncan Leaf]

Now that I've got a firewall running with iptables, I can't access the
external ip, even from the firewall box. ping shows all packets dropped.
tcp connections timeout.
I've been over this firewall and I don't understand why I can't access
the external ip. i'm hoping someone can point out my error, it would be
much appreciated. Here's the rc.firewall script:

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#!/bin/sh

LAN_IP_RANGE="192.168.0.0/24"
LAN_IP="192.168.0.1/32"
LAN_BCAST_ADRESS="192.168.0.255/32"
LOCALHOST_IP="127.0.0.1/32"
STATIC_IP="24.243.49.8/32"
INET_IFACE="eth0"
LAN_IFACE="eth1"
IPTABLES="/usr/sbin/iptables -v"


echo "1" > /proc/sys/net/ipv4/ip_forward


# Enable simple IP FORWARDing and Masquerading
#

$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source
24.243.49.8
$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG
--log-level DEBUG --log-prefix "IPT FORWARD packet died: "


#
# set default policies for the INPUT, FORWARD and OUTPUT chains
#

$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP

#
# Create separate chains for ICMP, TCP and UDP to traverse
#

$IPTABLES -N icmp_packets
$IPTABLES -N tcp_packets
$IPTABLES -N udpincoming_packets


#
# the allowed chain for TCP connections
#

$IPTABLES -N allowed
$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

#
# ICMP rules
#

$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 0 -j ACCEPT
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 3 -j ACCEPT
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 5 -j ACCEPT
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT

#
# TCP rules
#

$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 22 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 25 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 80 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 993 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 995 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 6066 -j allowed

#
# UDP ports
#

$IPTABLES -A udpincoming_packets -p UDP -s 0/0  --dport 6066 -j ACCEPT

#
# PREROUTING chain.
#
# Do some checks for obviously spoofed IP's
#

$IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 192.168.0.0/16 -j DROP
$IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 10.0.0.0/8 -j DROP
$IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 172.16.0.0/12 -j DROP

#
# INPUT chain
#
# establish the basic INPUT chain and filter the packets onto the
correct
# chains.
#


$IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets
$IPTABLES -A INPUT -p TCP -i $INET_IFACE -j tcp_packets
$IPTABLES -A INPUT -p UDP -i $INET_IFACE -j udpincoming_packets

$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BCAST_ADRESS -j ACCEPT
$IPTABLES -A INPUT -p ALL -d $LOCALHOST_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -d $LAN_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -d $STATIC_IP -m state --state
ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG
--log-level DEBUG --log-prefix "IPT INPUT packet died: "

#
# OUTPUT chain
#
# establish the basic OUTPUT chain and filter them onto the correct
chain
#

$IPTABLES -A OUTPUT -p ALL -s $LOCALHOST_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $STATIC_IP -j ACCEPT
$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG
--log-level DEBUG --log-prefix "IPT OUTPUT packet died: "
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