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Generic Routing Encapsulation is a tunnelling protocol, used to carry network layer protocols through encapsulation inside others.
8
votes
Is GRE necessary for an IP-only tunnel?
Running a tunnel over GRE has the added benefit of being pretty much protocol-agnostic, so you can of course use it for IPv6 later on. … With that said however, there's equally nothing stopping you running 6in4 or ip6ip6 alongside ipip, so the question really comes down to whether there's any tangible gain for you by choosing GRE and using …