Maybe a stupid question, what does a eoip tunnel?
http://en.wikipedia.org/wiki/Generic_Routing_Encapsulation
EoIP is pretty much just GRE with a Mikrotik proprietary header.
It tunnels all Layer 2 data. Since it’s not IP / routing dependent, it can do things like transmit IPX, appletalk, multicast, ARP, etc.
Most of the time you are better off doing pptp / l2tp / ipip and making it a routed link, but once in a while if you need to work with strange to legacy devices, EoIP is there.
Thanks for your reply’s