Lihat sumber Load Balance 2 ISP Mikrotik

/ip firewall nat
add action=masquerade chain=srcnat out-interface=------------
add action=masquerade chain=srcnat out-interface=------------


/ip firewall mangle
add action=mark-connection chain=prerouting dst-address-type=!local \
    in-interface=----- new-connection-mark=ISP1 passthrough=yes \
    per-connection-classifier=src-address-and-port:2/0
add action=mark-connection chain=prerouting dst-address-type=!local \
    in-interface=----- new-connection-mark=ISP2 passthrough=yes \
    per-connection-classifier=src-address-and-port:2/1
add action=mark-routing chain=prerouting connection-mark=ISP1 in-interface=\
    ----- new-routing-mark="Ke ISP1" passthrough=yes
add action=mark-routing chain=prerouting connection-mark=ISP2 in-interface=\
    ----- new-routing-mark="Ke ISP2" passthrough=yes


/ip route
add check-gateway=ping distance=1 gateway=------------ routing-mark="Ke ISP1"
add check-gateway=ping distance=1 gateway=------------ routing-mark="Ke ISP2"
add distance=1 gateway=----------,-----------