Hi, I had more or less the same question something like 2 years ago, and guess what, to date still no reply whatsoever. I'd think the plugin's developer is untraceable and/or "out of duty". Now back to the question, if I didn't misunderstood this GTPU plugin's semantics (by reading the code), this plugin doesn't operate as you'd expect from a mobile 3GPP point of view, it actually operates very similarly to how VXLAN does. What this plugin does is mainly implementing a *VTEP (Virtual Tunnel Endpoint)* , so its tunnel interface (i.e. gtpu_tunnelX ) needs an IP address on the same subnet of the actual destination of the encapped packet (i.e. the T-PDU). I know, it's somewhat confusing, but I studied and tried it, and I can confirm that it works this way. If you still want to really understand and use it, I'd suggest you to learn how VXLAN works and its terminology (if you don't know it yet), it'll be a lot easier for you to grasp this plugin's operation.
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