iptables help with sth plz

alaios · 09-17-2005, 09:40 PM

Hi i have two interfaces in my system
eth0
and eth1
each one has a unique ip address that belogns to a different network

Computer A MyLaptop(iptables here)
eth 0 ========cable============ eth1 eth0======== HUB

The traffic comes from the hub (right) to the eth0 of my laptop.. I want to change the packets so as to reach the eth0 of Computer A.,,, I want to do this thing for a specific ip address and a specific port that reaches my laptop's eth0
So i need to help me with this little problem

Matir · 09-17-2005, 10:04 PM

You'll need to use port forwarding to accomplish this. Do you have an existing NAT setup?

alaios · 09-18-2005, 03:41 AM

can u give me a smallexample plz?

Matir · 09-18-2005, 12:44 PM

Code:

/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 8888 -j DNAT --to 192.168.0.2:80
/sbin/iptables -A FORWARD -p tcp -i eth0 -d 192.168.0.2 --dport 80 -j ACCEPT

This will route port 8888 to 192.168.0.2:80.