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So, I have these instructions on converting my Linux machine to a router using (enable IP forwarding, NAT). Now my laptop has only one NIC and I want to test this setup. Any ideas how I can do this? Do I need to use Linux in VM and there is no other way? Or is there a network config that can show routing behaviour with one interface only? (Please give details if required, I am not very good on linux)

Note: If there is a tool, I need any that works, not the very best in one's opinion.

closed as unclear what you're asking by terdon, Faheem Mitha, Anthon, Zelda, Timo Feb 28 '14 at 16:13

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  • How to test what exactly? What are these instructions? Why don't you just follow them? – terdon Feb 28 '14 at 14:51
  • databook.bz/?page_id=697 These are the instructions, but it uses 2 NICs, I have one only, so most probably a VM based solution may work, I am not sure though. That's why I asked for help. – JuliandotNut Feb 28 '14 at 14:56
  • In addition, I want my router to work with arbitrary number of interfaces, which I think above mentioned settings will do. Please suggest if otherwise. – JuliandotNut Feb 28 '14 at 15:01
  • Considering your two questions, I think you should first test your environment on a virtual machine, on a virtual network. There you will be able to test all the configuration options easily. See for example virtualbox.org/manual/ch06.html – Cilyan Feb 28 '14 at 15:52
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If you read the instructions, it says clearly:

Three things are required to make a Linux box into a router. From a hardware standpoint you need two NICs.

Hence, unless you use a virtual machine when you can create as many virtual NICs you like, no, you can't make your system a router.

  • There is another config, called 'router on a stick', can I use Linux router to do that? It requires one interface for physical routers. And probably it will tell if machine is working as a router or not? – JuliandotNut Feb 28 '14 at 16:21

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