Dear friends,

I am trying to set up internet sharing. meaning I have a computer connected to internet, then i setup an iptables on the computer,
on the iptables i have say a rule like this:

$IPT -A FORWARD -s 192.168.27.44 -j ACCEPT

Meaning, i want computer with ip 192.168.27.44 to be able to directly connect to the internet. I have set echo 1 >/proc/sys/net/ipV4

On the computer with IP 192.168.27.44, i have also set the DNS to use my ISP dns, but when i try to connect to internet it doesn't work...

I can't figure out whats the problem...i thought the rule like that can give free access for any machine with ip 192.168.27.44 to the internet?

....anywhere i have made a mistake, thats just one rule of my iptables, of course is not the full script...

pls help me....thanks..

Regards
Y

Hi,

Copy and paste the code below, and make script executable....chmod 755 script_name.sh
then run ./script_name.... and that's it...
give your internal network interface ip address 192.168.1.1 and this will be a gateway for your machines connected to gateway...
Proper ip addresses for machines in private network are 192.168.1.2 192.168.1.3 and so on.

Take care to adjust this script to your needs, I mean if you are using ppp0 then figure out which interface you should change.
Make clear yourself which interface is external and which is internal in your case

Regards


#!/bin/sh

PATH=/usr/sbin:/sbin:/bin:/usr/bin

#
# delete all existing rules.
#
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X

# Always accept loopback traffic
iptables -A INPUT -i lo -j ACCEPT


# Allow established connections, and those not coming from the outside
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW -i ! eth1 -j ACCEPT
iptables -A FORWARD -i eth1 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow outgoing connections from the LAN side.
iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT

# Masquerade.
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

# Don't forward from the outside to the inside.
iptables -A FORWARD -i eth1 -o eth1 -j REJECT

# Enable routing.
echo 1 > /proc/sys/net/ipv4/ip_forward