/ip firewall mangle
add action=mark-routing chain=prerouting dst-address=!192.168.14.0/24 new-routing-mark=isd2 passthrough=no src-address=192.168.14.3
add action=mark-routing chain=prerouting dst-address=!192.168.14.0/24 new-routing-mark=isd1 passthrough=no src-address=192.168.14.2
add action=mark-connection chain=input dst-address=!192.168.0.0/24 new-connection-mark=isp1 passthrough=yes src-address=192.168.0.80
add action=mark-connection chain=input dst-address=!192.168.0.0/24 new-connection-mark=isp2 passthrough=yes src-address=192.168.0.81
add action=mark-routing chain=prerouting connection-mark=isp1 new-routing-mark=isd1 passthrough=yes
add action=mark-routing chain=prerouting connection-ma
и поясните ещё по-подробнее что вы хотите получить в конечном итоге