RH8.0 as router?

hi folks,
im tring to set RH8.0 as router. i ve 1 LAN card. and i set 2 ips 
on it, one for local area and another one is valid ip frm my 
isp.
internet is working fine and this server is acting as squid proxy 
server as well and running fine...and now i want this server to 
act as router too.. i configure the script as AS directed by HOWTO 
on TLDP.org.
now the problem is i can ping the external ip of server frm the 
LAN client but im not able to reach out to internet...
this is the script in including..
-------------------------------------



#!/bin/sh
#
# rc.firewall-2.4
FWVER=0.74
#
#               Initial SIMPLE IP Masquerade test for 2.4.x 
kernels
#               using IPTABLES.
#
#               Once IP Masquerading has been tested, with this 
simple
#               ruleset, it is highly recommended to use a 
stronger
#               IPTABLES ruleset either given later in this HOWTO 
or
#               from another reputable resource.
#
#
#
# Log:
#       0.74 - the ruleset now uses modprobe vs. insmod
#       0.73 - REJECT is not a legal policy yet; back to DROP
#       0.72 - Changed the default block behavior to REJECT not 
DROP
#       0.71 - Added clarification that PPPoE users need to use
#              "ppp0" instead of "eth0" for their external 
interface
#       0.70 - Added commented option for IRC nat module
#            - Added additional use of environment variables
#            - Added additional formatting
#       0.63 - Added support for the IRC IPTABLES module
#       0.62 - Fixed a typo on the MASQ enable line that used 
eth0
#              instead of $EXTIF
#       0.61 - Changed the firewall to use variables for the 
internal
#              and external interfaces.
#       0.60 - 0.50 had a mistake where the ruleset had a rule to 
DROP
#              all forwarded packets but it didn't have a rule to 
ACCEPT
#              any packets to be forwarded either
#            - Load the ip_nat_ftp and ip_conntrack_ftp modules by 
default
#       0.50 - Initial draft
#

echo -e "\n\nLoading simple rc.firewall version $FWVER..\n"


# The location of the iptables and kernel module programs
#
#   If your Linux distribution came with a copy of iptables,
#   most likely all the programs will be located in /sbin.  If
#   you manually compiled iptables, the default location will
#   be in /usr/local/sbin
#
# ** Please use the "whereis iptables" command to figure out
# ** where your copy is and change the path below to reflect
# ** your setup
#
#IPTABLES=/sbin/iptables
IPTABLES=/usr/local/sbin/iptables
DEPMOD=/sbin/depmod
MODPROBE=/sbin/modprobe


#Setting the EXTERNAL and INTERNAL interfaces for the network
#
#  Each IP Masquerade network needs to have at least one
#  external and one internal network.  The external network
#  is where the natting will occur and the internal network
#  should preferably be addressed with a RFC1918 private address
#  scheme.
#
#  For this example, "eth0" is external and "eth1" is internal"
#
#
#  NOTE:  If this doesnt EXACTLY fit your configuration, you 
must
#         change the EXTIF or INTIF variables above. For 
example:
#
#            If you are a PPPoE or analog modem user:
#
#               EXTIF="ppp0"
#
#
EXTIF=202.x.x.x
INTIF=192.168.10.222
echo "   External Interface:  $EXTIF"
echo "   Internal Interface:  $INTIF"


#======================================================================
#== No editing beyond this line is required for initial MASQ 
testing ==


echo -en "   loading modules: "

# Need to verify that all modules have all required dependencies
#
echo "  - Verifying that all kernel modules are ok"
$DEPMOD -a

# With the new IPTABLES code, the core MASQ functionality is now 
either
# modular or compiled into the kernel.  This HOWTO shows ALL 
IPTABLES
# options as MODULES.  If your kernel is compiled correctly, there 
is
# NO need to load the kernel modules manually.
#
#  NOTE: The following items are listed ONLY for informational 
reasons.
#        There is no reason to manual load these modules unless 
your
#        kernel is either mis-configured or you intentionally 
disabled
#        the kernel module autoloader.
#

# Upon the commands of starting up IP Masq on the server, the
# following kernel modules will be automatically loaded:
#
# NOTE:  Only load the IP MASQ modules you need.  All current IP 
MASQ
#        modules are shown below but are commented out from 
loading.
# 
===============================================================

echo 
"----------------------------------------------------------------------"

#Load the main body of the IPTABLES module - "iptable"
#  - Loaded automatically when the "iptables" command is invoked
#
#  - Loaded manually to clean up kernel auto-loading timing 
issues
#
echo -en "ip_tables, "
$MODPROBE ip_tables


#Load the IPTABLES filtering module - "iptable_filter"
#  - Loaded automatically when filter policies are activated


#Load the stateful connection tracking framework - 
"ip_conntrack"
#
# The conntrack  module in itself does nothing without other 
specific
# conntrack modules being loaded afterwards such as the 
"ip_conntrack_ftp"
# module
#
#  - This module is loaded automatically when MASQ functionality 
is
#    enabled
#
#  - Loaded manually to clean up kernel auto-loading timing 
issues
#
echo -en "ip_conntrack, "
$MODPROBE ip_conntrack


#Load the FTP tracking mechanism for full FTP tracking
#
# Enabled by default -- insert a "#" on the next line to 
deactivate
#
echo -en "ip_conntrack_ftp, "
$MODPROBE ip_conntrack_ftp


#Load the IRC tracking mechanism for full IRC tracking
#
# Enabled by default -- insert a "#" on the next line to 
deactivate
#
echo -en "ip_conntrack_irc, "
$MODPROBE ip_conntrack_irc


#Load the general IPTABLES NAT code - "iptable_nat"
#  - Loaded automatically when MASQ functionality is turned on
#
#  - Loaded manually to clean up kernel auto-loading timing 
issues
#
echo -en "iptable_nat, "
$MODPROBE iptable_nat


#Loads the FTP NAT functionality into the core IPTABLES code
# Required to support non-PASV FTP.
#
# Enabled by default -- insert a "#" on the next line to 
deactivate
#
echo -en "ip_nat_ftp, "
$MODPROBE ip_nat_ftp


#Loads the IRC NAT functionality into the core IPTABLES code
# Require to support NAT of IRC DCC requests
#
# Disabled by default -- remove the "#" on the next line to 
activate
#
#echo -e "ip_nat_irc"
#$MODPROBE ip_nat_irc

echo 
"----------------------------------------------------------------------"

# Just to be complete, here is a list of the remaining kernel 
modules
# and their function.  Please note that several modules should be 
only
# loaded by the correct master kernel module for proper 
operation.
# 
--------------------------------------------------------------------
#
#    ipt_mark       - this target marks a given packet for future 
action.
#                     This automatically loads the ipt_MARK 
module
#
#    ipt_tcpmss     - this target allows to manipulate the TCP 
MSS
#                     option for braindead remote firewalls.
#                     This automatically loads the ipt_TCPMSS 
module
#
#    ipt_limit      - this target allows for packets to be limited 
to
#                     to many hits per sec/min/hr
#
#    ipt_multiport  - this match allows for targets within a 
range
#                     of port numbers vs. listing each port 
individually
#
#    ipt_state      - this match allows to catch packets with 
various
#                     IP and TCP flags set/unset
#
#    ipt_unclean    - this match allows to catch packets that have 
invalid
#                     IP/TCP flags set
#
#    iptable_filter - this module allows for packets to be 
DROPped,
#                     REJECTed, or LOGged.  This module 
automatically
#                     loads the following modules:
#
#                     ipt_LOG - this target allows for packets to 
be
#                               logged
#
#                     ipt_REJECT - this target DROPs the packet 
and returns
#                                  a configurable ICMP packet back 
to the
#                                  sender.
#
#    iptable_mangle - this target allows for packets to be 
manipulated
#                     for things like the TCPMSS option, etc.

echo -e "   Done loading modules.\n"



#CRITICAL:  Enable IP forwarding since it is disabled by default 
since
#
#           Redhat Users:  you may try changing the options in
#                          /etc/sysconfig/network from:
#
#                       FORWARD_IPV4=false
#                             to
#                       FORWARD_IPV4=true
#
echo "   Enabling forwarding.."
echo "1" > /proc/sys/net/ipv4/ip_forward


# Dynamic IP users:
#
#   If you get your IP address dynamically from SLIP, PPP, or 
DHCP,
#   enable this following option.  This enables dynamic-address 
hacking
#   which makes the life with Diald and similar programs much 
easier.
#
echo "   Enabling DynamicAddr.."
echo "1" > /proc/sys/net/ipv4/ip_dynaddr


# Enable simple IP forwarding and Masquerading
#
#  NOTE:  In IPTABLES speak, IP Masquerading is a form of 
SourceNAT or SNAT.
#
#  NOTE #2:  The following is an example for an internal LAN 
address in the
#            192.168.0.x network with a 255.255.255.0 or a "24" 
bit subnet mask
#            connecting to the Internet on external interface 
"eth0".  This
#            example will MASQ internal traffic out to the 
Internet but not
#            allow non-initiated traffic into your internal 
network.
#
#
#         ** Please change the above network numbers, subnet mask, 
and your
#         *** Internet connection interface name to match your 
setup
#


#Clearing any previous configuration
#
#  Unless specified, the defaults for INPUT and OUTPUT is ACCEPT
#    The default for FORWARD is DROP (REJECT is not a valid 
policy)
#
echo "   Clearing any existing rules and setting default 
policy.."
$IPTABLES -P INPUT ACCEPT
$IPTABLES -F INPUT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -F OUTPUT
$IPTABLES -P FORWARD DROP
$IPTABLES -F FORWARD
$IPTABLES -t nat -F

echo "   FWD: Allow all connections OUT and only existing and 
related ones IN"
$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -m state --state 
ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -j LOG

echo "   Enabling SNAT (MASQUERADE) functionality on $EXTIF"
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE

echo -e "\nrc.firewall-2.4 v$FWVER done.\n"


---------------
Thanks
Tough guy

































































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