nguồn (http://www.easyzonecorp.net/network/view.php?ID=1390) copy dán vào chạy .
Script : 2 WAN(PPPoE) to 1 LAN

#|/ip address
/ip address add address=192.168.0.1/24 network=192.168.0.0 broadcast=192.168.0.255 interface=ether5 comment=”default configuration”

#|/ip firewall mangle
/ip firewall mangle add chain=input in-interface=pppoe-out1 action=mark-connection new-connection-mark=ether1_conn
/ip firewall mangle add chain=input in-interface=pppoe-out2 action=mark-connection new-connection-mark=ether2_conn

/ip firewall mangle add chain=output connection-mark=ether1_conn action=mark-routing new-routing-mark=to_ether1
/ip firewall mangle add chain=output connection-mark=ether2_conn action=mark-routing new-routing-mark=to_ether2

/ip firewall mangle add chain=prerouting dst-address-type=!local in-interface=ether5 per-connection-classifier=both-addresses-and-ports:2/0 action=mark-connection new-connection-mark=ether1_conn passthrough=yes
/ip firewall mangle add chain=prerouting dst-address-type=!local in-interface=ether5 per-connection-classifier=both-addresses-and-ports:2/1 action=mark-connection new-connection-mark=ether2_conn passthrough=yes
/ip firewall mangle add chain=prerouting connection-mark=ether1_conn in-interface=ether5 action=mark-routing new-routing-mark=to_ether1
/ip firewall mangle add chain=prerouting connection-mark=ether2_conn in-interface=ether5 action=mark-routing new-routing-mark=to_ether2

#|/ip route
/ip route add dst-address=0.0.0.0/0 gateway=pppoe-out1 routing-mark=to_ether1 check-gateway=ping
/ip route add dst-address=0.0.0.0/0 gateway=pppoe-out2 routing-mark=to_ether2 check-gateway=ping

/ip route add dst-address=0.0.0.0/0 gateway=pppoe-out1 distance=1 check-gateway=ping
/ip route add dst-address=0.0.0.0/0 gateway=pppoe-out2 distance=2 check-gateway=ping

#|/ip firewall nat
/ip firewall nat add chain=srcnat out-interface=pppoe-out1 action=masquerade
/ip firewall nat add chain=srcnat out-interface=pppoe-out2 action=masquerade

#| DHCP server is on switch, with address pool 192.168.0.100-192.168.0.200
/ip pool add name=default-dhcp ranges=192.168.0.100-192.168.0.200
/ip dhcp-server add name=default address-pool=default-dhcp interface=ether5 disabled=no
/ip dhcp-server network add address=192.168.0.0/24 gateway=192.168.0.1 dns-server=192.168.0.1 comment=”default configuration”

#| DNS
/ip dns set allow-remote-requests=yes
/ip dns static add name=router address=192.168.0.1

#| Now Configure DNS server so users can resolve hostnames,
#| Ex.cache-size=5000KiB
#| DNS Google = 8.8.8.8,8.8.4.4
#| DNS 3BB = 110.164.252.222,110.164.252.223
/ip dns set allow-remote-requests=yes cache-max-ttl=1w cache-size=5000K max-udp-packet-size=512 servers=8.8.8.8,8.8.4.4

sau khi chạy script xong chỉnh 1 chút là thành load pcc (tận dụng pc củ và lan cùi sẽ làm dc) :
+ETHER1: WAN VNPT
+ETHER2: WAN VIETTEL
+ETHER3: LOCAL