Hi to all,
I have a question about three tunneling protocols : GRE - IPIP - EOIP . I don’t know about advantage and disadvantage of those protocols and when I can use them (in different scenario).
what is difference between those ? and in what circumstances should they be used? which one is better? please describe in detail to clear me.
Thanks in advanced.
manual is pretty clear on this:
GRE
GRE (Generic Routing Encapsulation) is a tunnelling protocol that was originally developed by Cisco. It can encapsulate a wide variety of protocols creating a virtual point-to-point link.
GRE is the same as IPIP and EoIP which were originally developed as stateless tunnels. Which means that if the remote end of the tunnel goes down, all traffic that was routed over the tunnels will gets blackholed. To solve this problem, RouterOS have added ‘keepalive’ feature for GRE tunnels.
GRE tunnel adds a 24 byte overhead (4-byte gre header + 20-byte IP header).
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.
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.
IPIP
The IPIP tunneling implementation on the MikroTik RouterOS is RFC 2003 compliant. IPIP tunnel is a simple protocol that encapsulates IP packets in IP to make a tunnel between two routers. The IPIP tunnel interface appears as an interface under the interface list. Many routers, including Cisco and Linux, support this protocol. This protocol makes multiple network schemes possible.
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