i applied this scenario on mikrotik v 5.26 on x86 machine
/ip address
add address=192.168.0.1/24 network=192.168.0.0 broadcast=192.168.0.255 interface=local
add address=10.10.10.0/24 network=192.168.0.0 broadcast=10.10.10.255 interface=local
add address=10.0.0.100/24 network=192.168.1.0 broadcast=10.0.0.255 interface=WAN1
add address=5.5.5.200/24 network=192.168.2.0 broadcast=5.5.5.255 interface=WAN2
/ip dns set allow-remote-requests=yes cache-max-ttl=1w cache-size=5000KiB max-udp-packet-size=512 servers=221.132.112.8,8.8.8.8
/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=10.0.0.0/24 action=accept in-interface=local
add chain=prerouting dst-address=5.5.5.0/24 action=accept in-interface=local
add chain=prerouting dst-address-type=!local in-interface=local 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=local 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=local action=mark-routing new-routing-mark=to_WAN1
add chain=prerouting connection-mark=WAN2_conn in-interface=local action=mark-routing new-routing-mark=to_WAN2
/ip route
add dst-address=0.0.0.0/0 gateway=10.0.0.138 routing-mark=to_WAN1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=5.5.5.1 routing-mark=to_WAN2 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=10.0.0.138 distance=1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=5.5.5.1 distance=2 check-gateway=ping
/ip firewall nat
add chain=srcnat out-interface=WAN1 action=masquerade
add chain=srcnat out-interface=WAN2 action=masquerade
both wan lines are 8 Mbps
but when i test on speedtest.net or check the load balance by downloading a file i notice than only wan1 have activity while wan2 is not active for users connected on mikrotik.
what did i do wrong ??