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I want to simulate the following network with 2 laptops connected over internet. How can I do it? How can I set up the intefaces? [I'm using KVM if it matters]. Any help appreciated.

enter image description here

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What is the purpose of the simulation? Do you want to see e.g. how the communication between two NATted networks proceeds, are you interested in routing problems, or what else? – bitwelder Feb 28 '11 at 21:04
I want to collect some performance measurements of tunneling (OpenVPN and IPsec) with different encryption algorithms. I want to make it as realistic as possible. – bonzi Feb 28 '11 at 21:30
Do you have a router, or are you trying to do this without one? – belacqua Mar 1 '11 at 6:40
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I just realized you attached a png image of an ascii art diagram. Are you trying to break the internet? – belacqua Mar 1 '11 at 6:50
I'm trying to do it without a router. Btw I actually wanted to make an ASCII art but it was not displayed properly so I took a screenshot of it :D. I did mention this in my original post but it was edited :). – bonzi Mar 1 '11 at 7:51
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If you're not using a router, just connect one laptop's NIC to the other's NIC, you'll need to use a crossover Cat 5 cable. BTW, that's not "The Internet", it's just wires with Ethernet on them.

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You can also create an ad-hoc wireless netowork, as the two mentioned devices are laptops. Create the network on one laptop and have the other laptop connect to it. – rigved Sep 26 '11 at 10:06

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