I have 6 static IP's from my ISP, and I want to run a DMZ, LAN, and WIFI on my WRT54G:
I know what i have here are errors in the code, particularly how I am assigning the virtual interfaces in tghe iptables script.
Help!
#!/bin/sh
### ASSIGN IP AND INTERFACE VARIABLES
INET_IP="209.223.7.34"
INET_IP2="209.223.7.35" <----These are my static Ip's Im only using 4 for now
INET_IP3="209.223.7.36"
INET_IP4="209.223.7.37"
HTTP_IP="209.223.7.36"
DNS_IP="209.223.7.34"
LAN_IP="192.168.1.1"
INET_IFACE="vlan1"
INET_IFACE2="vlan1:0" <----These are my virtual interfaces. Is this not allowed?
INET_IFACE3="vlan1:1"
INET_IFACE4="vlan1:2"
LAN_IFACE="vlan0"
#
# 1.3 DMZ Configuration.
#
DMZ_HTTP_IP="192.168.0.2"
DMZ_DNS_IP="192.168.0.254"
DMZ_IP="192.168.0.1"
DMZ_IFACE="vlan2"
#
# 1.4 Localhost Configuration.
#
LO_IFACE="lo"
LO_IP="127.0.0.1"
#
# 1.5 IPTables Configuration.
#
IPTABLES="/usr/sbin/iptables"
#
# 1.6 Other Configuration.
## CLEAR TABLES
for T in filter nat; do
iptables -t $T -F
iptables -t $T -X
done
#
# 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 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
#
# ICMP rules
#
# Changed rules totally
$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 the Internet to this box
#
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE2 -j icmp_packets
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE3 -j icmp_packets
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE4 -j icmp_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
#
# From Localhost interface to Localhost IP's
#
$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
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP2 -j ACCEPT <----wildcards here?
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP3 -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP4 -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
#
# All established and related packets incoming from the internet to the
# firewall
#
$IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -p ALL -d $INET_IP2 -m state --state ESTABLISHED,RELATED -j ACCEPT <--- should i use wildcards here? Can I?
$IPTABLES -A INPUT -p ALL -d $INET_IP3 -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -p ALL -d $INET_IP4 -m state --state ESTABLISHED,RELATED -j ACCEPT
#
# 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 $DMZ_IFACE -o $INET_IFACE2 -j ACCEPT
$IPTABLES -A FORWARD -i $DMZ_IFACE -o $INET_IFACE3 -j ACCEPT
$IPTABLES -A FORWARD -i $DMZ_IFACE -o $INET_IFACE4 -j ACCEPT
$IPTABLES -A FORWARD -i $INET_IFACE -o $DMZ_IFACE -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INET_IFACE2 -o $DMZ_IFACE -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INET_IFACE3 -o $DMZ_IFACE -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INET_IFACE4 -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_IFACE3 -o $DMZ_IFACE -d $DMZ_HTTP_IP \
--dport 80 -j allowed
$IPTABLES -A FORWARD -p ICMP -i $INET_IFACE3 -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
#
# LAN section
#
$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -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_IFACE -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $INET_IFACE2 -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $INET_IFACE3 -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $INET_IFACE4 -j ACCEPT
#
# 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: "
$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE3 -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
#
# Enable simple IP Forwarding and Network Address Translation for LAN network
#
$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP