O Melhor de Jeito mais simples de juntar 2 links e separando a porta 80, o interessante e que vc soma a taxa de download, mas so serve se for so 2 links.
exemplo
Link1 - 192.168.1.1
Link2 - 192.168.2.2
/ip firewall mangle
add action=mark-routing chain=prerouting comment="" disabled=no dst-port=80 new-routing-mark=load passthrough=yes protocol=tcp
/ip route
add comment=Load Balance disabled=no distance=1 dst-address=0.0.0.0/0 gateway=192.168.1.1,192.168.2.2 routing-mark="load" scope=255 target-scope=10
add comment=Outros disabled=no distance=1 dst-address=0.0.0.0/0 gateway=192.168.1.1 scope=255 target-scope=10
espero ajudar
qualquer duvida e so postar