Redirect all traffic to IP nn to internal IP xx

Red Squirrel · 03-16-2009, 10:08 PM

Lets say I have 24 external IP addresses of 120.120.120.1-120.120.120.24 on one server, and on that server I have an internal IP of 192.168.1.10 (VMware "host only" network or internal NAT).

I want all traffic directed at 120.120.120.20 to go to the internal IP 192.168.0.10, and I want all traffic coming out of that IP come out as from 120.120.120.20.

So basically, guess this would be a simple NAT.

How would I do this in iptables, what are the commands?

I'd also like to fine tune it where I block most traffic and only allow a few ports.

I also want to be able to block IPs, that part I know how.

Could someone point me in the right direction for writing a rule like this?

Thanks.

kristrev · 03-17-2009, 05:20 PM

Hi,

I recomned this page, it has very good explanation of iptables. But in summary, you will use PREROUTING rules for configuring the direction of the traffic.