2 wan loadblance

/ip firewall mangle
add chain=prerouting in-interface=pppoe-out1
add chain=prerouting in-interface=pppoe-out2
add action=mark-connection chain=prerouting dst-address-type=!local \
    new-connection-mark=wan1_conn passthrough=yes per-connection-classifier=\
    both-addresses-and-ports:2/0
add action=mark-connection chain=prerouting dst-address-type=!local \
    new-connection-mark=wan2_conn passthrough=yes per-connection-classifier=\
    both-addresses-and-ports:2/1
add action=mark-routing chain=prerouting connection-mark=wan1_conn \
    new-routing-mark=to_wan1
add action=mark-routing chain=prerouting connection-mark=wan2_conn \
    new-routing-mark=to_wan2

/ip route
add check-gateway=ping distance=1 gateway=pppoe-out1 routing-mark=to_wan1
add check-gateway=ping distance=1 gateway=pppoe-out2 routing-mark=to_wan2