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If different namespaces, the socket lookup should fail and > thus the behavior be the same as on a host without a tunnel. Different one: the vxlan sat in the init namespace, the test in the ns it creates. The static key is global, though, so the tunnel turns the lookup on everywhere, and the lookup then runs in the test's receiving namespace, where it finds the test's own receiver: a plain socket bound to any address, without UDP_GRO. That is why the check goes from 1 to 10 the moment a tunnel exists anywhere on the host.