year. First publicly released in September 2000 with RouterOS v2.1 beta, this protocol was created to simplify bridging of
Ethernet networks and connecting remote locations into a single network, by creating a tunnel on top of an IP connection.
When the bridging function of the router is enabled, all Ethernet frames (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.
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.
The first MikroTik documentation page was created a little later, as EoIP appeared. EoIP is still very popular today, and is
supported by all RouterBOARD devices by default.
To celebrate the 15th anniversary of EoIP, Mikrotik is adding keyphrase encryption support. Simply add a keyphrase to
the configuration of each EoIP interface and all traffic over the tunnel will by encrypted using IPsec. With the addition of
encryption, the protocol is still simple, robust, and easy to use.