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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 tunne or any other connection capable of transporting IP.
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. 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: 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 cower wireless configuration in this example, lets assume that wireless link is already established At first we create EoIP tunnel on our gateway ... ... and on Remote router Next step is to bridge local interfaces with EoIP tunnel On Our GW ... ... and Remote router: Now both sites are in the same Layer2 broadcast domain. You can set up IP addresses from the same network on both sites.Summary
/interface eoip
GRE RFC 1701
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:Properties
Property Description arp (disabled | enabled | proxy-arp | reply-only; Default: enabled) Address Resolution Protocol mode l2mtu (integer; Default: ) Layer2 Maximum transmission unit. Not configurable for EoIP. Read more>>
mac-address (MAC; Default: ) Media Access Control number of an interface. The address numeration authority allows to use MAC addresses in the range from00:00:5E:80:00:00 - 00:00:5E:FF:FF:FF freely mtu (integer; Default: 1500) Layer3 Maximum transmission unit name (string; Default: ) Interface name remote-address (IP; Default: ) IP address of remote end of EoIP tunnel tunnel-id (integer: 65536; Default: ) Unique tunnel identifier, which must match other side of the tunnel Notes
tunnel-id
is method of identifying tunnel. It must be unique for each EoIP tunnel.
mtu
should be set to 1500 to eliminate packet refragmentation inside the tunnel (that allows transparent bridging of Ethernet-like networks, so that it would be possible to transport full-sized Ethernet frame over the tunnel).
When bridging EoIP tunnels, it is highly recommended to set unique MAC addresses for each tunnel for the bridge algorithms to work correctly. For EoIP interfaces you can use MAC addresses that are in the range from00:00:5E:80:00:00 - 00:00:5E:FF:FF:FF , which IANA has reserved for such cases. Alternatively, you can set the second bit of the first byte to mark the address as locally administered address, assigned by network administrator, and use any MAC address, you just need to ensure they are unique between the hosts connected to one bridge.Setup examples
[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>
[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>
[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>
[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>
Manual:Interface/EoIP
www.basic-mikrotik.blogspot.com on 09.04. VPN -
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