search tag # rextended dual wan failover
It’s like you ask for dual WAN failover than a load balancing
Use this as example, you must disable default roure creation on dhcp clients and remove predefined routes on /ip route
:global isp1gateway 177.142.96.44
:global isp2gateway 192.168.0.254
/ip dns
set servers=1.1.1.1,8.8.8.8
/ip route
add comment="A - 1.1.1.1 must be reachable only from ISP1" distance=1 dst-address=1.1.1.1/32 gateway=$isp1gateway scope=10
add comment="B - Recursive Routing, check ping 1.1.1.1 instead of ISP1 IP" distance=10 gateway=1.1.1.1 check-gateway=ping
add comment="C - ISP2 is alternative Gateway" distance=20 gateway=$isp2gateway
EDIT: see next posts for v7 version