That will only work if you are on the same subnet. When you craft a packet for that address, the stack will see that route and send an ARP "who has" request ou

That will only work if you are on the same subnet. When you craft a packet for that address, the stack will see that route and send an ARP "who has" request out whatever interface you assigned when you did that IP route rule (probably your default ethernet). If nobody responds than the packet dies in the stack.