redirect connec to ex int to int

redirect connec to ex int to int

[Fernando La Gamba]

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I'm trying to redirect connections from outside (external interface) to a
internal machine (192.168.200.252), but i dont know why, nothing happend.

Someone can tell me whats wrong with this rules?

#!/bin/bash

export IPTABLES=/usr/local/sbin/iptables
export MODPROBE=/sbin/modprobe

$MODPROBE ip_nat_ftp
$MODPROBE ip_conntrack
$MODPROBE ip_conntrack_ftp
$MODPROBE ipt_string
echo 1 > /proc/sys/net/ipv4/ip_forward

$IPTABLES -F
$IPTABLES -F -t nat
$IPTABLES -F -t mangle
$IPTABLES -X
$IPTABLES -Z

echo "- Enabling SNAT (MASQUERADE) funtionality on eth0"

#<INTERFACES>
IF_EXT=eth0
IF_INT=eth1
#</INTERFACES>

#<REDES>
ANY=0.0.0.0/0
NET_INT=192.168.0.0/16
#</REDES>

#<sERVIDOR WEB>
IP_WEB_INT=192.168.200.252
IP_WEB_EXT=200.X.X.X
#</sERVIDOR WEB>


$IPTABLES -N EXT_SRVWEB
$IPTABLES -A EXT_SRVWEB -p tcp -s $ANY --sport 1024: -d $IP_WEB_INT --dport
10001 -i $IF_EXT -o $IF_INT -j ACCEPT
$IPTABLES -A EXT_SRVWEB -j DROP

$IPTABLES -N SRVWEB_EXT
$IPTABLES -A SRVWEB_EXT -p tcp -s $IP_WEB_INT --sport 10001 -d $ANY --dport
1024: -i $IF_INT -o $IF_EXT -j ACCEPT
$IPTABLES -A SRVWEB_EXT -j DROP

$IPTABLES -t nat -A PREROUTING -d $IP_WEB_EXT -j DNAT --to $IP_WEB_INT -i
$IF_EXT

$IPTABLES -A FORWARD -j EXT_SRVWEB -s $ANY      -d $IP_WEB_INT -i $IF_EXT -o
$IF_INT
$IPTABLES -A FORWARD -j SRVWEB_EXT -s $IP_WEB_INT -d $ANY      -i $IF_INT -o
$IF_EXT

$IPTABLES -A POSTROUTING -t nat -s $IP_WEB_INT -d $ANY -j SNAT --to
$IP_WEB_EXT -o $IF_EXT
$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s $NET_INT -o $IF_EXT

Thanks
____________________________
Fastrack Soluções e Sistemas
Fernando La Gamba
Network Admin / Security
Com.: 5506-6044 R. 614
Cel.: 9214-2176


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