LoadBalancing Proxy Web

set always-from-cache=no cache-administrator=webmaster cache-hit-dscp=4 cache-on-disk=yes enabled=yes max-cache-size=unlimited max-client-connections=600 max-fresh-time=3d max-server-connections=600 parent-proxy=0.0.0.0 parent-proxy-port=0 port=8080 serialize-connections=no src-address=0.0.0.0

/ip firewall mangle
add action=mark-connection chain=input disabled=no in-interface=WAN1 new-connection-mark=WAN1_conn passthrough=yes
add action=mark-connection chain=input disabled=no in-interface=WAN3 new-connection-mark=WAN3_conn passthrough=yes

add action=mark-connection chain=output comment="Marking Web Proxy Connection for WAN-1" disabled=no dst-port=80 new-connection-mark=WAN1_conn passthrough=yes per-connection-classifier=both-addresses-and-ports:2/0 protocol=tcp
add action=mark-connection chain=output comment="Marking Web Proxy Connection for WAN-2" disabled=no dst-port=80 new-connection-mark=WAN3_conn passthrough=yes per-connection-classifier=both-addresses-and-ports:2/1 protocol=tcp

add action=mark-connection chain=prerouting comment="Excluding Port 80 from PCC - WAN1" disabled=no dst-address-type=!local dst-port=!80 in-interface=Local new-connection-mark=WAN1_conn passthrough=yes per-connection-classifier=both-addresses-and-ports:2/0 protocol=tcp
add action=mark-connection chain=prerouting comment="Excluding Port 80 from PCC - WAN3" disabled=no dst-address-type=!local dst-port=!80 in-interface=Local new-connection-mark=WAN3_conn passthrough=yes per-connection-classifier=both-addresses-and-ports:2/1 protocol=tcp

add action=mark-routing chain=prerouting connection-mark=WAN1_conn disabled=no in-interface=Local new-routing-mark=to_WAN1 passthrough=yes
add action=mark-routing chain=prerouting connection-mark=WAN3_conn disabled=no in-interface=Local new-routing-mark=to_WAN3 passthrough=yes

add action=mark-routing chain=output connection-mark=WAN1_conn disabled=no new-routing-mark=to_WAN1 passthrough=yes
add action=mark-routing chain=output connection-mark=WAN3_conn disabled=no new-routing-mark=to_WAN3 passthrough=yes

add action=accept chain=prerouting disabled=no dst-address=192.168.4.0/24 in-interface=Local
add action=accept chain=prerouting disabled=no dst-address=192.168.7.0/24 in-interface=Local

/ip firewall nat
add action=masquerade chain=srcnat comment="Masquerade WAN1 Traffic" disabled=no out-interface=WAN1
add action=masquerade chain=srcnat comment="Masquerade WAN3 Traffic" disabled=no out-interface=WAN3
add action=redirect chain=dstnat comment="Redirect port 80 request to Mikrotik Web Proxy" disabled=no dst-port=80 protocol=tcp to-ports=8080

/ip route
add check-gateway=ping disabled=no distance=2 dst-address=0.0.0.0/0 gateway=192.168.4.250 routing-mark=to_WAN1 scope=30 target-scope=10
add check-gateway=ping disabled=no distance=1 dst-address=0.0.0.0/0 gateway=192.168.7.240 routing-mark=to_WAN3 scope=30 target-scope=10

add check-gateway=ping disabled=no distance=1 dst-address=0.0.0.0/0 gateway=192.168.4.250 scope=30 target-scope=10
add check-gateway=ping disabled=no distance=2 dst-address=0.0.0.0/0 gateway=192.168.7.240 scope=30 target-scope=10