Re: [CentOS] How to access one machine behind iptables, on different subnet?

On Friday 29 October 2010 04:22:52 Rudi Ahlers wrote:

How do I give full access to all ports on this IP, instead of forwarding every port?

Sure. That's called One-to-One NAT. You'll do something like this:

iptables -t nat -I PREROUTING -d 192.168.1.20 -j DNAT --to-destination $GREEN

...where $GREEN is one ip on your 192.168.2.x network. Then make sure you have the proper "allow" rules on the INPUT chain for your LAN ip ($GREEN).

The above was for ingress traffic. Now, for egress traffic (for this internal LAN ip) you'll need to perform NAT as well:

iptables -t nat -A POSTROUTING -s $GREEN -j SNAT --to-source 192.168.1.20

Check out:

http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux...

HTH, Jorge