Policy base Routing (2 WAN- 2LAN) in mikrotik router

Policy Based Routing (2 WAN- 2LAN) in mikrotik router 

We will assume that you already have the IP addresses set up on your router.

First, we must define our routes. We will add three “default” routes. These are below:

/ip route
add gateway=10.10.11.1 routing-mark=ISP2
add gateway=10.10.10.1 routing-mark=ISP1
add gateway=10.10.10.1 

add gateway=10.10.11.1  distance 10

All traffic from the 192.168.0.0/24 network will use ISP1 and all traffic from the 192.168.1.0/24 network will use ISP2. Here is the implementation:

/ip firewall mangle

add chain=prerouting src-address=192.168.0.0/24 dst-address=192.168.0.1 action=accept 

add chain=prerouting src-address=192.168.1.0/24 dst-address=192.168.1.1 action=accept 

add chain=prerouting src-address=192.168.0.0/24 action=mark-routing \
new-routing-mark=ISP1 passthrough=no

add chain=prerouting src-address=192.168.1.0/24 action=mark-routing \
new-routing-mark=ISP2 passthrough=no

/ip firewall nat 

add chain=src-nat outinterface=ISP1_WAN action=masqurate  

add chain=src-nat outinterface=ISP2_WAN action=masqurate  

add chain=src-nat WAN action=masqurate  

[Ref:https://www.youtube.com/watch?v=m6tYANGC9o0]

[Ref:http://blog.butchevans.com/2008/09/mikrotik-policy-routing-implementation-example/]