Thanks Adam. Maybe I should clarify my question. I am not concerned with Inbound (internet into MX) translation here. This is typically accomplished with 1:1 static NATs or some form of Port Forwarding (static PAT). My question is will the MX perform outbound dynamic translation for any LAN facing subnet that is in the local route table; including static routes pointing to subnets reachable via next hop LAN interfaces?
In my situation I will have an MX configured in NAT mode. The WAN interface is connected to an Internet circuit, the LAN interface is connccted to a L3 switch. Local VLANs are disabled under “Addressing & VLANs ”. Static routes are configured for internal reachability.