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I have a linux machine used as gateway for a Win XP machine. Both are in Virtual machine for testing purpose. Now I want to trick the Win XP user (me) with the forwarding of an IP address: I want to change the destination IP address.

For example I want to go to but linux gateway change it to So if I'm expecting the web page of, I'll get the changed one, the one of For example I want to go to Facebook and I'm forced to Google home page.

How can I do it? With prerouting? Because I've done lot of tries, but no one working :(

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2 Answers 2

That is not going to reliably work with iptables alone, because HTTP requests send along a Host: header. And it is unlikely that Google would know how to serve a page for Install a proper proxy software, such as squid.

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And if I don't do http traffic, but other kind of traffic? – Possa Apr 28 '11 at 12:32

Basically, what you must do is:

  1. Configure the Linux box to act as a router

  2. Change the Default Gateway of the Windows box to point to the IP of the Linux box

  3. Do a DNAT, e.g. :

    iptables -t nat -A PREROUTING -i $INCOMING_INTERFACE -d $DEST_IP -j DNAT --to $NEW_DEST_IP
  4. Also do a SNAT, e.g.

  5. Make sure that no iptables rule/policy drops your traffic

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It doesn't work for me :( The prerouting appearently goes well, but the postrouting doesn't work. I did a tcpdump and the linux gateway convert the DEST_IP to NEW_DEST_IP, but when NEW_DEST_IP send the packet back, the XP system send a Reset packet. – Possa May 2 '11 at 15:01
@Possa did the Source Address of the packet gets converted from the original XP's address to the Linux box's address? – pepoluan May 3 '11 at 2:46

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