Hello!
I try to do a simple port-forwarding setup with my linux 2.4.18 and
iptables v1.2.6a. I use this linux box for handling my DSL and
iptables for masquerading to enable internet use for internal machines.
Now I want to configure iptables to forward all incoming port 80 requests
from the outside(internet) to my new internal webserver box.
INTERNET
| (Dynamic IP, ppp0)
linux iptables box
| (192.168.100.1, eth0)
+--------------------------+ internal network
| (192.168.100.X) | (192.168.100.5)
some machines box with webserver (port 80)
I have read a lot of how-to's and created a simple iptables script
for testing. The masquerading for internet access e.g. surfing works,
but can't get any connection to my webserver from the outside.
I have no idea what what's wrong and hope that somebody can
give me a hint about my mistake..
Thanks a lot for your time!
Alex
------- my simple test script -------
#!/bin/sh
echo "1" > /proc/sys/net/ipv4/ip_forward
# iptables command
IPTABLES="/usr/local/sbin/iptables"
# Network Interfaces
INT_IF="eth0"
EXT_IF="ppp0"
# internal network range
NETWORK="192.168.100.0/24"
# simple policies for testing
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
# masquerading
$IPTABLES -t nat -A POSTROUTING -o $EXT_IF -s $NETWORK -j MASQUERADE
# port forwarding
$IPTABLES -t nat -A PREROUTING -p tcp -i $EXT_IF --dport 80 -j DNAT --to
192.168.100.5:80
# no forwarding rules, because the chain accepts all...
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