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Introduction
Sub-menu: /interface eoipPackages required: system
Ethernet over IP (EoIP) Tunneling is a MikroTik RouterOS protocol based on GRE RFC 1701 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.
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| Property | Description |
|---|---|
| allow-fast-path (yes | no; Default: yes) | Whether to allow FastPath processing. Must be disabled if IPsec tunneling is used. |
| arp (disabled | enabled | proxy-arp | reply-only; Default: enabled) | Address Resolution Protocol mode.
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| arp-timeout (integer[/time]; Default: auto) | Time interval in which ARP entries should time out. |
| clamp-tcp-mss (yes | no; Default: yes) | Controls whether to change MSS size for received TCP SYN packets. When enabled, a router will change the MSS size for received TCP SYN packets if the current MSS size exceeds the tunnel interface MTU (taking into account the TCP/IP overhead).The received encapsulated packet will still contain the original MSS, and only after decapsulation the MSS is changed. |
| comment (string; Default: ) | Short description of the interface. |
| disabled (yes | no; Default: no) | Whether an item is disabled. |
| dont-fragment (inherit | no; Default: no) | Whether to include DF bit in related packets: no - fragment if needed, inherit - use Dont Fragment flag of original packet. (Without Dont Fragment: inherit - packet may be fragmented). |
| dscp (integer: 0-63; Default: inherited) | DSCP value of packet. Inherited option means that dscp value will be inherited from packet which is going to be encapsulated. |
| ipsec-secret (string; Default: ) | When secret is specified, router adds dynamic IPsec peer to remote-address with pre-shared key and policy (by default phase2 uses sha1/aes128cbc). |
| keepalive (integer[/time],integer 0..4294967295; Default: 10s,10) | Tunnel keepalive parameter sets the time interval in which the tunnel running flag will remain even if the remote end of tunnel goes down. If configured time,retries fail, interface running flag is removed. Parameters are written in following format: KeepaliveInterval,KeepaliveRetries where KeepaliveInterval is time interval and KeepaliveRetries - number of retry attempts. By default keepalive is set to 10 seconds and 10 retries. |
| l2mtu (integer; read-only) | Layer2 Maximum transmission unit. Not configurable for EoIP. MTU in RouterOS |
| local-address (IP; Default: ) | Source address of the tunnel packets, local on the router. |
| loop-protect | |
| loop-protect-disable-time | |
| loop-protect-send-interval | |
| mac-address (MAC; Default: ) | Media Access Control number of an interface. The address numeration authority IANA allows the use of MAC addresses in the range from 00:00:5E:80:00:00 - 00:00:5E:FF:FF:FF freely |
| mtu (integer; Default: auto) | 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 |
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Verify the bridge port section:
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[admin@APadmin@Station] > /interface bridge port print Flags: I - INACTIVE; H - HW-OFFLOAD Columns: INTERFACE, BRIDGE, HW, PVID, PRIORITY, PATH-COST, INTERNAL-PATH-COST, HORIZON # INTERFACE BRIDGE HW PVID PRIORITY PATH-COST INTERNAL-PATH-COST HORIZON 0 H ether2 bridge1 yes 1 0x80 10 10 none 2 eoip-main bridge1 yes 1 0x80 10 10 none |
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