Setting Load Balance dan Fail Over di Mikrotik

Pengantar
Sesuaikan skenario dengan yang anda hadapi. Baca dahulu dengan teliti. Diasumsikan server Mikrotik memiliki 3 (tiga) buah interfaces (NIC) dan dalam kondisi fresh install.

Skenario:

1. ISP Telkom-Speedy (ADSL)

IP Router ADSL(LAN): 192.168.0.254

IP DNS1: 202.134.0.155

IP DNS2: 202.134.2.5

2. ISP Diginet (Wireless)

IP: 203.81.187.62

IP Gateway: 203.81.187.62

IP DNS1: 203.81.185.12

IP DNS2: 203.81.185.13

Jumlah Komputer Internet: 50 pc –>
Network: 192.168.3.0/26 (Ip Address: 192.168.3.1 – 192.168.3.63 Netmask: 255.255.255.192)
Jumlah Komputer Games: 50 pc –>
Network: 192.168.3.64/26 (Ip Address: 192.168.3.65 – 192.168.3.128 Netmask: 255.255.255.192)

Langkah-langkah:
1. Beri nama Interfaces Ether1-3 di [Interfaces]
Command

/interface set ether1 name=Telkom
/interface set ether2 name=Diginet
/interface set ether3 name=Local

admin@BlueSky.Net] > interface print
Flags: X - disabled, D - dynamic, R - running
# NAME            TYPE     RX-RATE      TX-RATE MTU
0 R Telkom        ether    0   0        1500
1 R Diginet       ether    0   0        1500
2 R Local         ether    0   0        1500

2. Beri IP Address untuk masing-masing ethernet. [Ip - Interfaces]
Command:

/ip address add address=192.168.0.253/24 interface=Telkom
/ip address add address=203.81.187.62/24 interface=Diginet
/ip address add address=192.168.3.0/24      interface=Local

[admin@BlueSky.Net] > ip address print
Flags: X - disabled, I - invalid, D - dynamic
# ADDRESS                NETWORK    BROADCAST     INTERFACE
0 192.168.0.253/24   192.168.0.0    192.168.0.255    Telkom
1 192.168.3.254/24   192.168.3.0    192.168.3.255     Local
2 203.81.187.62/24   203.81.187.0  203.81.187.255    Diginet

3. Buat rule di [IP – Firewall - Mangle]:
- chain=prerouting src-address=192.168.3.0/26 action=mark-routing new-routing mark=Internet
“untuk menandai paket yang berasal dari 192.168.3.0/26 dengan nama=Internet”
- chain=prerouting src-address=192.168.3.64/26 action=mark-routing new-routing-mark=Games
“untuk menandai paket yang berasal dari 192.168.3.64/26 dengan nama=Games”
Command:

/ip firewall mangle add chain=prerouting src-address=192.168.3.0/26 \
action=mark-routing new-routing-mark=Internet
/ip firewall mangle add chain=prerouting src-address=192.168.3.64/26 \
action=mark-routing new-routing-mark=Games
[admin@BlueSky.Net] ip firewall mangle> print
Flags: X - disabled, I - invalid, D - dynamic
0 chain=prerouting src-address=192.168.3.0/26 action=mark-routing
new-routing-mark=Internet passthrough=yes
1 chain=prerouting src-address=192.168.3.64/26 action=mark-routing
new-routing-mark=Games passthrough=yes

4. Set Gateway untuk masing-masing network. [IP - Route]
Command:

/ip route add gateway=192.168.0.254 dst-address=0.0.0.0/0 routing-mark=Internet
/ip route add gateway=203.81.187.1 dst-address=0.0.0.0/0 routing-mark=Games

[admin@BlueSky.Net] > ip route print
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf
# DST-ADDRESS         PREFSRC         GATEWAY DIS INTE
0 ADC 192.168.0.0/24  192.168.0.253   Telkom
1 ADC 192.168.3.0/24  192.168.3.254   Local
2 ADC 203.81.187.0/24 203.81.187.62   Diginet
3 A S 0.0.0.0/0 r     192.168.0.254   Telkom
4 A S 0.0.0.0/0 r     203.81.187.1    Diginet

5. Buat rule nat-masquerade untuk network 192.168.3.0/24 [IP - Firewall - Nat]
Command:

/ip firewall nat add chain=srcnat src-address=192.168.3.0/24 action=masquerade

[admin@BlueSky.Net] > ip firewall nat print
Flags: X - disabled, I - invalid, D - dynamic
0 ;;; Masquerade Network 192.168.3.0/24
chain=srcnat src-address=192.168.3.0/24 action=masquerade

6. Buat script untuk melakukan cek gw dengan tools netwatch:
Command:

/system script add name=check-gw source={
:local R1
:local R2
:if ([/tool netwatch get R1 status]=up) do={:set R1 192.168.0.254}
:if ([/tool netwatch get R2 status]=up) do={:set R2 203.81.187.1}
/ip route set [/ip route find dst-address=0.0.0.0/0] \
gateway=($R1 . , . $R2)
}
/tool netwatch add comment=R1 host=192.168.0.254 interval=5s up-script=check-gw \
down-script=check-gw
/tool netwatch add comment=R2 host=203.81.187.1 interval=5s up-script=check-gw \
down-script=check-gw

Setting di Mikrotik sudah selesai.
Berikutnya, isikan IP address untuk tiap client Internet dengan IP Address mulai dari: 192.168.3.1 sampai 192.168.3.63.
Gunakan Netmask 255.255.255.192 agar workgroup terpisah dengan Games.
Jangan lupa berikan IP DNS Telkom di network-properties client Internet sesuai skenario di atas (202.134.0.155 dan 202.134.2.5).
Gateway diarahkan ke: 192.168.3.254.
Untuk Client Games isikan IP Address mulai dari: 192.168.3.65 sampai dengan 192.168.3.128.
Gunakan juga Netmask 255.255.255.192 jika menginginkan workgroup yang terpisah dengan Client untuk Internet.
Berikan IP DNS Diginet (203.81.185.12 dan 203.81.185.13) di network-propertiesnya.
Gateway diisikan dengan 192.168.3.254.
Selamat mencoba…