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List:       openvswitch-discuss
Subject:    [ovs-discuss] openvswitch GRE tunnel cannot cooperate with GRE tunnel of traditional devices
From:       blp () nicira ! com (Ben Pfaff)
Date:       2014-08-27 16:38:31
Message-ID: 20140827163831.GM7405 () nicira ! com
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On Wed, Aug 27, 2014 at 09:58:25AM +0000, ??????(???? ????) wrote:
>        By compare the GRE packet sending from traditional router and
>        the one sending from openvswitch GRE tunnel, we can find out
>        that traditional GRE packet contains no lay-2 frame
>        header(ether source and dest MAC, that??s IP over IP), however,
>        openvswitch??s GRE packet contains the entire frame including
>        layer-2(that??s MAC over IP).

"GRE" can basically encapsulate anything in anything.  That's what makes
it "generic".  Open vSwitch currently supports only GRE tunnels that
encapsulate Ethernet.  Therefore, if the device that you're trying to
talk to does not support GRE tunnels that encapsulate Ethernet, it will
not work.

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