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I would like to "overwrite" IP addresses that already exists on the public internet. So, I want to create multiple loopback interfaces on a machine, so I can ping any IP address that I configure from other machines in the same local network, as long as there is a static route configured to the machine containing the loopbacks.

What would be the best method, using iproute2? It seems I can create a dummy interface, but also a veth (virtual Ethernet) interface. Is one of these the best solution, or would something else be preferred?

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So, it seems that just adding more subnets to the lo interface works perfectly fine:

ip addr add 192.168.40.1/32 dev lo, which makes this address reachable to the outside world.

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