TUNCHANNEL = "TunChannel"
NS3_TESTBED_ID = "ns3"
-FDNETDEV = "ns3::FileDescriptorNetDevice"
+FDNETDEV = "ns3::FdNetDevice"
def _follow_trace(testbed_instance, guid, trace_id, filename):
filepath = testbed_instance.trace_filepath(guid, trace_id, filename)