In routerOS, when setting a route, instead of adding a gateway IP address, you can select the only an interface.
- If that interface is PPPoE, routerOS will automatically set the GW to the PPPoE GW when it connects
- If that interface has a /30 network on it, routerOS will automatically set the GW to the other available address on the /30
So why can't routerOS automatically find the default gateway address when DHCP is running on that interface and assign it to that route?