I have setup an L2TP/IPsec service on a CCR and I want to use a subnet for the users including an address
for the router. This subnet is separate from the LAN subnet.
In a Cisco router that is replaced by this CCR I used a Loopback interface for this.
In Linux I would use a “dummy” interface.
But RouterOS does not allow to add a dummy interface.
What is the normal way of doing this? For now I have added the subnet as an extra address on the LAN
interface, but it does not feel right and is unclear in the firewall rules.
The usual “loopback” interface method in Mikrotik is to add a bridge and call it “Loopback”
I just read it in another message you replied to 
That indeed is a good idea, and it appears to work.
Maybe they wanted to reduce the clutter and did not offer the dummy interface for that reason…
Yeah - it does give me a slightly different feel than a dummy interface, though - I can’t think of anything specific at this very moment other than that you have to define an administrative MAC address on the loop bridge if using IPv6-only on the interface (the interface never can generate its link-local address to base things around).