Routing issue

Hello!, I have a routing question. I placed a mikrotik in a client with a static route dst=0.0.0.0/0 gateway=10.70.3.101. I have two sets of addresses in that router (1 set is private which I NAT) and a Public. The gateway 10.70.3.101 is part of an ospf core network. The problem is that the public address is in the LAN interface (x.x.x.x/30) to a unmanaged switch that connects the end user to the router and he is not being able to reach the internet. What am I missing in the config.