1.Mikrotik Load Balancing and Fail Over For 2 Static IP WAN (NTH Method)

Simple Diagram:

 

Script:

/interface ethernet set 0 name=WAN1 set 1 name=WAN2 set 2 name=LAN /ip address add address=192.168.10.2/24 network=192.168.10.0 broadcast=192.168.10.255 interface=WAN1 add address=192.168.20.2/24 network=192.168.20.0 broadcast=192.168.20.255 interface=WAN2 add address=192.168.1.1/24 network=192.168.1.0 broadcast=192.168.1.255 interface=LAN /ip firewall mangle add chain=prerouting in-interface=LAN connection-state=new nth=2,1 action=mark-connection new-connection-mark=conn1 passthrough=yes comment="" disabled=no add chain=prerouting in-interface=LAN connection-mark=conn1 action=mark-routing new-routing-mark=conn1 passthrough=no comment="" disabled=no add chain=prerouting in-interface=LAN connection-state=new nth=2,2 action=mark-connection new-connection-mark=conn2 passthrough=yes comment="" disabled=no add chain=prerouting in-interface=LAN connection-mark=conn2 action=mark-routing new-routing-mark=conn2 passthrough=no comment="" disabled=no /ip firewall nat add chain=srcnat connection-mark=conn1 action=masquerade out-interface=WAN1 comment="" disabled=no add chain=srcnat connection-mark=conn2 action=masquerade out-interface=WAN2 comment="" disabled=no /ip route add dst-address=0.0.0.0/0 gateway=192.168.10.1 scope=255 target-scope=10 routing-mark=conn1 comment="" disabled=no add dst-address=0.0.0.0/0 gateway=192.168.20.1 scope=255 target-scope=10 routing-mark=conn2 comment="" disabled=no add dst-address=0.0.0.0/0 gateway=192.168.10.1 comment="" disabled=no add dst-address=0.0.0.0/0 gateway=192.168.20.1 comment="" disabled=no