Script:
/ip address
add address=103.28.2.254/30 interface=WAN1
add address=103.28.0.254/30 interface=WAN2
add address=192.168.2.1/24 interface=bridge-LAN
/ip dns set allow-remote-requests=yes cache-max-ttl=1w cache-size=5000KiB max-udp-packet-size=512 servers=103.28.3.187,8.8.8.8
/ip firewall mangle
add chain=input in-interface=WAN1 action=mark-connection new-connection-mark=WAN1_conn
add chain=input in-interface=WAN2 action=mark-connection new-connection-mark=WAN2_conn
add chain=output connection-mark=WAN1_conn action=mark-routing new-routing-mark=to_WAN1
add chain=output connection-mark=WAN2_conn action=mark-routing new-routing-mark=to_WAN2
add chain=prerouting dst-address=103.28.2.252/30 action=accept in-interface=bridge-LAN
add chain=prerouting dst-address=103.28.0.252/30 action=accept in-interface=bridge-LAN
add chain=prerouting dst-address-type=!local in-interface=bridge-LAN per-connection-classifier=both-addresses-and-ports:2/0 action=mark-connection new-connection-mark=WAN1_conn passthrough=yes
add chain=prerouting dst-address-type=!local in-interface=bridge-LAN per-connection-classifier=both-addresses-and-ports:2/1 action=mark-connection new-connection-mark=WAN2_conn passthrough=yes
add chain=prerouting connection-mark=WAN1_conn in-interface=bridge-LAN action=mark-routing new-routing-mark=to_WAN1
add chain=prerouting connection-mark=WAN2_conn in-interface=bridge-LAN action=mark-routing new-routing-mark=to_WAN2
/ip firewall nat
add chain=srcnat out-interface=WAN1 action=masquerade
add chain=srcnat out-interface=WAN2 action=masquerade
/ip route
add dst-address=0.0.0.0/0 gateway=103.28.2.253 routing-mark=to_WAN1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=103.28.0.253 routing-mark=to_WAN2 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=103.28.2.253 distance=1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=103.28.0.253 distance=2 check-gateway=ping
Note: if you have more then 2 WANs you just add:
1. ip --> Address
2. ip --> firewall --> Mangle
3. ip --> firewall --> NAT
4. ip --> route.
Example: you have three WANs:
/ip address
add address=103.28.2.254/30 interface=WAN1
add address=103.28.0.254/30 interface=WAN2
add address=192.168.2.1/24 interface=bridge-LAN
/ip dns set allow-remote-requests=yes cache-max-ttl=1w cache-size=5000KiB max-udp-packet-size=512 servers=103.28.3.187,8.8.8.8
/ip firewall mangle
add chain=input in-interface=WAN1 action=mark-connection new-connection-mark=WAN1_conn
add chain=input in-interface=WAN2 action=mark-connection new-connection-mark=WAN2_conn
add chain=output connection-mark=WAN1_conn action=mark-routing new-routing-mark=to_WAN1
add chain=output connection-mark=WAN2_conn action=mark-routing new-routing-mark=to_WAN2
add chain=prerouting dst-address=103.28.2.252/30 action=accept in-interface=bridge-LAN
add chain=prerouting dst-address=103.28.0.252/30 action=accept in-interface=bridge-LAN
add chain=prerouting dst-address-type=!local in-interface=bridge-LAN per-connection-classifier=both-addresses-and-ports:3/0 action=mark-connection new-connection-mark=WAN1_conn passthrough=yes
add chain=prerouting dst-address-type=!local in-interface=bridge-LAN per-connection-classifier=both-addresses-and-ports:3/1 action=mark-connection new-connection-mark=WAN2_conn passthrough=yes
add chain=prerouting connection-mark=WAN1_conn in-interface=bridge-LAN action=mark-routing new-routing-mark=to_WAN1
add chain=prerouting connection-mark=WAN2_conn in-interface=bridge-LAN action=mark-routing new-routing-mark=to_WAN2
/ip firewall nat
add chain=srcnat out-interface=WAN1 action=masquerade
add chain=srcnat out-interface=WAN2 action=masquerade
/ip route
add dst-address=0.0.0.0/0 gateway=103.28.2.253 routing-mark=to_WAN1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=103.28.0.253 routing-mark=to_WAN2 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=103.28.2.253 distance=1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=103.28.0.253 distance=2 check-gateway=ping
--------------------Add Config--------------------------
/ip address
add address=X.X.X.X/X interface=WAN3
/ip firewall mangle
add chain=input in-interface=WAN3 action=mark-connection new-connection-mark=WAN3_conn
add chain=output connection-mark=WAN3_conn action=mark-routing new-routing-mark=to_WAN3
add chain=prerouting dst-address=X.X.X.X/X action=accept in-interface=bridge-LAN
add chain=prerouting dst-address-type=!local in-interface=bridge-LAN per-connection-classifier=both-addresses-and-ports:3/2 action=mark-connection new-connection-mark=WAN3_conn passthrough=yes
add chain=prerouting connection-mark=WAN3_conn in-interface=bridge-LAN action=mark-routing new-routing-mark=to_WAN3
/ip firewall nat
add chain=srcnat out-interface=WAN3 action=masquerade
/ip route
add dst-address=0.0.0.0/0 gateway=X.X.X.X/X routing-mark=to_WAN3 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=X.X.X.X/X distance=1 check-gateway=ping
------------------------------------------------------------
Note: per-connection-classifier=both-addresses-and-ports:3/2 is equal the amount of your WANs.
Ref: http://wiki.mikrotik.com/wiki/Load_Balancing
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