Ini adalah project coba2 menggabungkan 2 buah kantor menggunakan EOIP mikrotik. Ceritanya disuruh nggabungin 2 kantor yang lokasinya lumayan jauh. Terus tanya2 ke temen, katanya gampang. Tinggal pake protokol EOIP nya mikrotik. Yang penting, dua kantor itu punya IP publik masing2, nanti IP publik kantor A ditaruh di router B, IP publik Router B ditaruh di A, udah gitu aja beres.

Nah pas waktu dijelasin ngga gitu kebayang seh, tapi pas dikerjain ternyata emang bener2 mudah, ga ribet2 ini itu.

Berikut link tutorial yang saya comot langsung dari sini http://wiki.mikrotik.com/wiki/Manual:Interface/EoIP

Ethernet over IP (EoIP) Tunneling is a MikroTik RouterOS protocol that creates an Ethernet tunnel between two routers on top of an IP connection. The EoIP tunnel may run over IPIP tunnel, PPTP tunnel or any other connection capable of transporting IP.
When the bridging function of the router is enabled, all Ethernet traffic (all Ethernet protocols) will be bridged just as if there where a physical Ethernet interface and cable between the two routers (with bridging enabled). This protocol makes multiple network schemes possible.

Network setups with EoIP interfaces:

  • Possibility to bridge LANs over the Internet
  • Possibility to bridge LANs over encrypted tunnels
  • Possibility to bridge LANs over 802.11b ‘ad-hoc’ wireless networks

The EoIP protocol encapsulates Ethernet frames in GRE (IP protocol number 47) packets (just like PPTP) and sends them to the remote side of the EoIP tunnel.

Setup examples

Let us assume we want to bridge two networks: ‘Office LAN’ and ‘Remote LAN’. By using EoIP setup can be made so that Office and Remote LANs are in the same Layer2 broadcast domain.

Consider following setup:

Eoip-example.png

As you know wireless station cannot be bridged, to overcome this limitation (not involving WDS) we will create EoIP tunnel over the wireless link and bridge it with interfaces connected to local networks.

We will not cover wireless configuration in this example, lets assume that wireless link is already established

At first we create EoIP tunnel on our gateway …

[admin@Our_GW] interface eoip> add name="eoip-remote" tunnel-id=0 \
\... remote-address=10.0.0.2
[admin@Our_GW] interface eoip> enable eoip-remote
[admin@Our_GW] interface eoip> print
Flags: X - disabled, R - running
  0    name=eoip-remote mtu=1500 arp=enabled remote-address=10.0.0.2 tunnel-id=0
[admin@Our_GW] interface eoip>

… and on Remote router

[admin@Remote] interface eoip> add name="eoip" tunnel-id=0 \
\... remote-address=10.0.0.1
[admin@Remote] interface eoip> enable eoip-main
[admin@Remote] interface eoip> print
Flags: X - disabled, R - running
  0   name=eoip mtu=1500 arp=enabled remote-address=10.0.0.1 tunnel-id=0

[admin@Remote] interface eoip>

Next step is to bridge local interfaces with EoIP tunnel On Our GW …

[admin@Our_GW] interface bridge> add 
[admin@Our_GW] interface bridge> print
Flags: X - disabled, R - running
 0  R name="bridge1" mtu=1500 arp=enabled mac-address=00:00:00:00:00:00 
      protocol-mode=none priority=0x8000 auto-mac=yes 
      admin-mac=00:00:00:00:00:00 max-message-age=20s forward-delay=15s 
      transmit-hold-count=6 ageing-time=5m 
[admin@Our_GW] interface bridge> port add bridge=bridge1 interface=eoip-remote
[admin@Our_GW] interface bridge> port add bridge=bridge1 interface=office-eth
[admin@Our_GW] interface bridge> port print
Flags: X - disabled, I - inactive, D - dynamic
 #    INTERFACE      BRIDGE  PRIORITY PATH-COST
 0    eoip-remote    bridge1 128      10
 1    office-eth     bridge1 128      10
[admin@Our_GW] interface bridge>

… and Remote router:

[admin@Remote] interface bridge> add 
[admin@Remote] interface bridge> print
Flags: X - disabled, R - running
 0  R name="bridge1" mtu=1500 arp=enabled mac-address=00:00:00:00:00:00 
      protocol-mode=none priority=0x8000 auto-mac=yes 
      admin-mac=00:00:00:00:00:00 max-message-age=20s forward-delay=15s 
      transmit-hold-count=6 ageing-time=5m 
[admin@Remote] interface bridge> port add bridge=bridge1 interface=ether
[admin@Remote] interface bridge> port add bridge=bridge1 interface=eoip-main
[admin@Remote] interface bridge> port print
Flags: X - disabled, I - inactive, D - dynamic
 #    INTERFACE      BRIDGE  PRIORITY PATH-COST
 0    ether          bridge1 128      10
 1    eoip-main      bridge1 128      10     
[admin@Remote] interface bridge>

Now both sites are in the same Layer2 broadcast domain. You can set up IP addresses from the same network on both sites.