Im trying to setup a different hotspot on 2 PORTS , on a RB493.
How do I change the gateway so each hotspot has its own?
By default the hotspot just uses the gateway set in routes.
Set a routing mark for one ip range.
/ip firewall mangle
add chain=prerouting action=mark-routing new-routing-mark=route2 src-address=192.168.1.0/24
Then add a second default route
/ip route
add dst-address=0.0.0.0/0 gateway=x.x.x.x routing-mark=route2
x.x.x.x is gateway for 192.168.1.0/24. All others will take the default route with no routing-mark.