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.