Disini saya selaku admin ingin membagi tutorial untuk Load Balancing 3 Line Speedy dan saya sendiri menggunakan RouterBoard 750 (mipsbe) dengan versi 4. untuk tutorial ini masih sederhana tapi 100% berjalan dan normal.

Interface 3 Line Speedy
Speedy1 = 192.168.1.1 -> 1 Mbps
Speedy2 = 192.168.2.1 -> 400 Kbps
Speedy3 = 192.168.3.1 -> 400 Kbps

Untuk Modem ADSLnya disetting BRIDGE MODE ya. dan ganti tanda biru di bawah dengan ID dan Password speedy anda:

 /interface pppoe-client
add ac-name="" add-default-route=no allow=pap,chap,mschap1,mschap2 comment="" \
    dial-on-demand=no disabled=no interface=SPEEDY1 max-mru=1480 max-mtu=1480 \
    mrru=disabled name=Modem-1 password=XXXXXXX profile=default \
    service-name="" use-peer-dns=no user=XXXXXXX@telkom.net
add ac-name="" add-default-route=no allow=pap,chap,mschap1,mschap2 comment="" \
    dial-on-demand=no disabled=no interface=SPEEDY2 max-mru=1480 max-mtu=1480 \
    mrru=disabled name=Modem-2 password=XXXXXXX profile=default \
    service-name="" use-peer-dns=no user=XXXXXXX@telkom.net
add ac-name="" add-default-route=no allow=pap,chap,mschap1,mschap2 comment="" \
    dial-on-demand=no disabled=no interface=SPEEDY3 max-mru=1480 max-mtu=1480 \
    mrru=disabled name=Modem-3 password=XXXXXXX profile=default \
    service-name="" use-peer-dns=no user=XXXXXXX@telkom.net

dan tambah Ip Address ip LAN dan modem speedynya, gunanya untuk ngeping ke modem untuk memastikan kabel LAN normal atau tidak normal. dan jangan lupa ganti interfacenya sesuai dengan interface milik anda :

 /ip address
add address=192.168.0.1/24 broadcast=192.168.0.255 comment="" disabled=no \
    interface=LAN network=192.168.0.0
add address=192.168.1.2/24 broadcast=192.168.1.255 comment="" disabled=no \
    interface=SPEEDY1 network=192.168.1.0
add address=192.168.2.2/24 broadcast=192.168.2.255 comment="" disabled=no \
    interface=SPEEDY2 network=192.168.2.0
add address=192.168.3.2/24 broadcast=192.168.3.255 comment="" disabled=no \
    interface=SPEEDY3 network=192.168.3.0

Sekarang setting DNSnya:

 /ip dns
set allow-remote-requests=yes cache-max-ttl=1w cache-size=2048KiB \
    max-udp-packet-size=512 primary-dns=202.134.1.10 secondary-dns=\
    202.134.0.155


Setting Manglenya:

 /ip firewall mangle
add action=mark-connection chain=prerouting comment="Load balancing" \
    connection-state=new disabled=no in-interface=LAN new-connection-mark=\
    Pendy-1 nth=3,1 passthrough=yes
add action=mark-routing chain=prerouting comment="" connection-mark=modem-1 \
    disabled=no in-interface=LAN new-routing-mark=modem-1 passthrough=no
add action=mark-connection chain=prerouting comment="" connection-state=new \
    disabled=no in-interface=LAN new-connection-mark=modem-2 nth=3,2 \
    passthrough=yes
add action=mark-routing chain=prerouting comment="" connection-mark=modem-2 \
    disabled=no in-interface=LAN new-routing-mark=modem-2 passthrough=no
add action=mark-connection chain=prerouting comment="" connection-state=new \
    disabled=no in-interface=LAN new-connection-mark=modem-3 nth=3,3 \
    passthrough=yes
add action=mark-routing chain=prerouting comment="" connection-mark=modem-3 \
    disabled=no in-interface=LAN new-routing-mark=modem-3 passthrough=no

NATnya:
 /ip firewall nat
add action=masquerade chain=srcnat comment="" disabled=no out-interface=\
    Modem-1
add action=masquerade chain=srcnat comment="" disabled=no out-interface=\
    Modem-2
add action=masquerade chain=srcnat comment="" disabled=no out-interface=\
    Modem-3

Routersnya:

 /ip route
add comment="" disabled=no distance=1 dst-address=0.0.0.0/0 gateway=Modem-1 \
    routing-mark=modem-1 scope=30 target-scope=10
add comment="" disabled=no distance=1 dst-address=0.0.0.0/0 gateway=Modem-2 \
    routing-mark=modem-2 scope=30 target-scope=10
add comment="" disabled=no distance=1 dst-address=0.0.0.0/0 gateway=Modem-3 \
    routing-mark=modem-3 scope=30 target-scope=10
add comment="Jalur utama" disabled=no distance=1 dst-address=0.0.0.0/0 \
    gateway=Modem-1 scope=30 target-scope=10

Udah selesai deh, untuk bandwith managementnya seperti biasa, dan jangan lupa untuk yang tulisan berwarna merah sesuaikan dengan interface anda. selamat mencoba.