I have an IKEv1 transport mode SA between Strongswan (Linux) and a Cisco router.
I'm sending multipoint GRE packets (GRE with the destination address pulled from the original packet) between the routers. I'm also trying to get multicast working over this mGRE tunnel. Strongswan is successfully encapsulating mGRE packets with unicast destination addresses, but is not encapsulating mGRE packets with multicast destinations and is instead letting them through to the underlying interface. Is this a configuration issue? Is this a kernel issue? Is this a Strongswan issue? Any help is appreciated. ~ Zach
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