Server Mikrotik least had 3 NIC

1. ether1 —>Astinet
2. ether2 —>Jardiknas
3. ether3 —>Lan

Steps:

1. Give the name of Interfaces Ether1-3 in Interfaces

[admin@MikroTik] interface> pr
Flags: X – disabled, D – dynamic, R – running
# NAME TYPE RX-RATE TX-RATE MTU
0 R Astinet ether 0 0 1500
1 R Jardiknas ether 0 0 1500

1 R Lan ether 0 0 1500

2. Give IP Address for each one ethernet

[admin@mikrotik] > ip address print
Flags: X – disabled, I – invalid, D – dynamic
# ADDRESS NETWORK BROADCAST INTERFACE
0 192.168.205.2 /24 192.168.205.0 192.168.205.255 Astinet
1 192.168.204.2/24 192.168.204.0 192.168.204.255 Jardiknas
2 192.168.9.2/24 192.168.9.0 192.168.9.255 Lan

3. Make Rule

[admin@MikroTik] ip firewall mangle> pr
Flags: X – disabled, I – invalid, D – dynamic
0 chain=prerouting in-interface=Local action=mark-routing
new-routing-mark=pegawai passthrough=yes

3. Set Gateway for each one network

/ip route add gateway=192.168.205.5 dst-address=0.0.0.0/0 routing-mark=Pegawai
/ip route add gateway=192.168.204.5 dst-address=0.0.0.0/0 routing-mark=Mahasiswa

/ip route add gateway=192.168.205.5,192.168.204.5,192.168.205.5
check-gateway=ping routing-mark=Mahasiswa
5. show ip route

[admin@MikroTik] ip> route pr
Flags: X – disabled, A – active, D – dynamic,
C – connect, S – static, r – rip, b – bgp, o – ospf
# DST-ADDRESS PREF-SRC G GATEWAY DISTANCE INTERFACE
0 ADC 192.168.9.0/24 192.168.9.2 Local
1 ADC 192.168.204.0/24 192.168.204.2 Public
2 ADC 192.168.205.0/24 192.168.205.2 Public
3 A S 0.0.0.0/0 r 192.168.205.5 Public
4 S 0.0.0.0/0 r 192.168.204.5 Public
5 A S 0.0.0.0/0 r 192.168.204.5 Public
r 192.168.205.5 Public
r 192.168.204.5 Public

4. Make rule nat-masquerade for network 192.168.9.0/24

/ip firewall nat add chain=srcnat src-address=192.168.9.0/24 action=masquerade

5. Show nat -masquerade network

[admin@mikrotik] > ip firewall nat print
Flags: X – disabled, I – invalid, D – dynamic
0 ;;; Masquerade Network 192.168.9.0/24
chain=srcnat src-address=192.168.9.0/24 action=masquerade

6. Complete

Source : http://mikrotik.unimedcenter.org/?p=28

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