PCC matcher will allow you to divide traffic into equal streams with ability to keep packets with specific set of options in one particular stream (you can specify this set of options from src-address, src-port, dst-address, dst-port)
Step 2: Add both ISP IP address in Mikrotik Address list.
Steps 3: Go to mangle and create mangle rules.
Steps 4: Then go to nat and create nat rules.
Steps 5: Go to routes and create routes rules.
Steps 6: Finally configure is done.
Explanation: Let's assume this configuration.
/ip address
add address=192.168.170.18/24 comment=ISP_01 interface=ether1 network=192.168.170.0
add address=172.16.1.2/30 comment=ISP_02 interface=ether2 network=172.16.1.0
add address=192.168.0.1/24 comment=Local interface=ether3 network=192.168.0.0
Policy routing:
/ip firewall mangle
add chain=input dst-address=192.168.170.0/24
add chain=input dst-address=172.16.0.0/30
add action=mark-connection chain=prerouting connection-mark=no-mark \ in-interface=ether1 new-connection-mark=ISP_01_IN
add action=mark-connection chain=prerouting connection-mark=no-mark \ in-interface=ether2 new-connection-mark=ISP_02_IN
add action=mark-connection chain=prerouting connection-mark=no-mark \ dst-address-type=!local in-interface=ether3 new-connection-mark=ISP_01_IN \ per-connection-classifier=src-address:2/0
add action=mark-connection chain=prerouting connection-mark=no-mark \ dst-address-type=!local in-interface=ether3 new-connection-mark=ISP_02_IN \ per-connection-classifier=src-address:2/1
add action=mark-routing chain=prerouting connection-mark=ISP_01_IN \ in-interface=ether3 new-routing-mark=ISP_01_OUT passthrough=no
add action=mark-routing chain=prerouting connection-mark=ISP_02_IN \ in-interface=ether3 new-routing-mark=ISP_02_OUT passthrough=no
add action=mark-routing chain=output connection-mark=ISP_01_IN \ new-routing-mark=ISP_01_OUT
add action=mark-routing chain=output connection-mark=ISP_02_IN \ new-routing-mark=ISP_02_OUT
Nating rule:
/ip firewall nat
add action=masquerade chain=srcnat out-interface=ether1
add action=masquerade chain=srcnat out-interface=ether2
Routing
/ip route
add check-gateway=ping distance=1 gateway=192.168.170.254 routing-mark=ISP_01_OUT
add check-gateway=ping distance=2 gateway=172.16.1.1 routing-mark=ISP_02_OUT
add check-gateway=ping distance=1 gateway=172.16.1.1,192.168.170.254
END