What is the reason that you cannot set the tunnel's other side as destination address? Is this because it is virtual only?
192.168.1.0/30 is the subnet I'm using and this is my configuration:
tunnel1 ip add 192.168.1.1 255.255.255.252 tunnel source (doesn't matter) tunnel dest 192.168.1.2
tunnel dest 192.168.1.2 -> Why is this invalid?